html - CSS3-特殊的边框半径

我想用CSS3做一个独特的形状。
我使用Bootstrap 3网格系统来制作元素的布局。
我已经构建了这个形状的大部分，但是我无法使border-radius属性在元素内部循环。
形状：

我已经做了什么：

codepen
CSS:

.test-midbox{
    height: 170px;
    background-color: white ;
    padding-left: 0px;
    padding-right: 0px;
    margin-right: 0;
    margin-left: 0;
    border: solid black 1px;
    top: 20px;

}
.test-inbox{
    margin-right: 0;
    margin-left: 0;
    background-image: url("../images/linux.jpg") !important;
    background-repeat: no-repeat;
    background-position: center;
    background-size: auto 80%;
    height: 170px;
    padding-top:10px;
    padding-left:10px;
    padding-right:10px;
    padding-bottom:40px;
}
.monitor-name:before{
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    z-index: -2;
    display: block;
    height: 100%;
    background: black;
    opacity: 0.7;
    border-bottom-right-radius: 20px;
    border-top-right-radius: 20px;
}
.monitor-name{
    z-index: 100;
    position: absolute;
    height: 40px;
    bottom: 20px;
    text-align: center;
    color: white;
    border:black 1px solid;
    border-left: none;
    border-bottom-right-radius: 20px;
    border-top-right-radius: 20px;
}
.monitor-name-text{
    top:1px;
    text-align: center;
}
.test-puls{
    position: absolute;
    height: 20px;
    padding-left: 0px;
    padding-right: 0px;
    margin-right: 0;
    margin-left: 0;
    border-top: 1px black solid;
    bottom: 15px;
}
.btn-plus{
    border-radius: 0;
}
.btn-cir{
    border: 1px solid black;
    position: absolute;
    height: 40px;
    bottom: 20px;
    padding-left: 0px;
    padding-right: 0px;
}

HTML格式：

<div class="col-lg-3 test-outerbox">
    <div class="test-midbox col-lg-12">
        <div class="col-lg-12 col-lg-offset-1 test-inbox">
        </div>
        <div class="col-lg-12 col-lg-offset-1 test-puls">
        </div>
        <div class="monitor-name col-lg-10 col-lg-push-2">
            <h4 class="monitor-name-text">tsdsds</h4>
        </div>
        <div class="col-lg-2 btn-cir">k</div>
    </div>
</div>

最佳答案

border-radius将始终只产生向外的曲线，而不会向内弯曲。因此，单靠它不能产生你所需要的效果。以下是产生所需效果的几种方法。你可以选择一个最适合你的情况。
我没有使用基于Twitter引导的标记，但您应该可以直接转换。
使用z索引：
如果所有项目都有不透明的背景（即没有alpha值），并且元素的数量是有限的固定数量，则使用z-index将元素放置在彼此的顶部，以便第一个元素位于第二个元素的顶部，而第二个元素又位于第三个元素的顶部，依此类推。所有元素也设置为负margin-right以产生重叠效果。因为背景是不透明的，所以第一个元素的边框看起来就像第二个元素有一个向内弯曲的边框，依此类推。
注：这似乎不适合你的情况下提供的图像，但已添加完整性。

.items {
  position: relative;
  float: left;
  height: 50px;
  width: 200px;
  margin-right: -60px;
  line-height: 50px;
  text-align: center;
  border: 1px solid brown;
}
.elongated-border-curve .items {
  border-radius: 0% 35% 35% 0% / 0% 50% 50% 0%;
}
.shorter-border-curve .items {
  border-radius: 0% 20% 20% 0% / 0% 50% 50% 0%;
}
.items:nth-of-type(n+2) {
  border-left: 0;
  background: wheat;
}
.items:first-of-type {
  background: sandybrown;
  color: white;
  z-index: 3;
}
.items:nth-of-type(2) {
  z-index: 2;  /* lower z-index than first */
}
.items:nth-of-type(3) {
  z-index: 1;  /* lower z-index than second */
}
.items:last-of-type {  /* default z-index 0 */
  border-radius: 0%;
}

/* just for demo */
h3 {
  clear: both;
}
.elongated-border-curve, .shorter-border-curve {
  padding-bottom: 50px;
}
body {
  background: radial-gradient(circle at 50% 50%, aliceblue, mediumslateblue);
  min-height: 500px;
}

<h3>With Elongated Border Curves</h3>
<div class='elongated-border-curve'>
  <div class='items'>Item 1</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 2</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 3</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 4</div>  <!-- give each item a z-index lower than the previous one -->
</div>

<h3>With Shorter Border Curves</h3>
<div class='shorter-border-curve'>
  <div class='items'>Item 1</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 2</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 3</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 4</div>  <!-- give each item a z-index lower than the previous one -->
</div>

动态宽度样本：

.items {
  position: relative;
  float: left;
  height: 50px;
  width: 32%;
  margin-right: -10%;
  line-height: 50px;
  text-align: center;
  border: 1px solid brown;
}
.elongated-border-curve .items {
  border-radius: 0% 35% 35% 0% / 0% 50% 50% 0%;
}
.shorter-border-curve .items {
  border-radius: 0% 20% 20% 0% / 0% 50% 50% 0%;
}
.items:nth-of-type(n+2) {
  border-left: 0;
  background: wheat;
}
.items:first-of-type {
  background: sandybrown;
  color: white;
  z-index: 3;
}
.items:nth-of-type(2) {
  z-index: 2;  /* lower z-index than first */
}
.items:nth-of-type(3) {
  z-index: 1;  /* lower z-index than second */
}
.items:last-of-type {  /* default z-index 0 */
  border-radius: 0%;
}

/* just for demo */
h3 {
  clear: both;
}
.elongated-border-curve, .shorter-border-curve {
  padding-bottom: 50px;
}
body {
  background: radial-gradient(circle at 50% 50%, aliceblue, mediumslateblue);
  min-height: 500px;
}

<h3>With Elongated Border Curves</h3>
<div class='elongated-border-curve'>
  <div class='items'>Item 1</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 2</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 3</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 4</div>  <!-- give each item a z-index lower than the previous one -->
</div>

<h3>With Shorter Border Curves</h3>
<div class='shorter-border-curve'>
  <div class='items'>Item 1</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 2</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 3</div>  <!-- give each item a z-index lower than the previous one -->
  <div class='items'>Item 4</div>  <!-- give each item a z-index lower than the previous one -->
</div>

带方框阴影：
如果所有项目都有坚实的背景（不透明或透明），但元素的数量不是有限的，就是很大（因此很难采用以前的方法），请在下面代码片段中的伪元素上使用具有较大扩展半径的box-shadow。
当元素具有渐变或图像作为背景时，此方法将不起作用。

.items {
  float: left;
  height: 50px;
  width: 200px;
  margin-right: -60px;
  line-height: 50px;
  text-align: center;
  border: 1px solid brown;
}
.elongated-border-curve .items {
  border-radius: 0% 35% 35% 0% / 0% 50% 50% 0%;
}
.shorter-border-curve .items {
  border-radius: 0% 20% 20% 0% / 0% 50% 50% 0%;
}
.items:first-of-type {
  z-index: 3;
}
.items:nth-of-type(n+2) {
  position: relative;
  border-left: 0;
  overflow: hidden;
}
.items:nth-of-type(n+2):after {
  position: absolute;
  content: '';
  height: 100%;
  width: 100%;
  top: 0px;
  left: -140px;  /* -(parent's margin-right) - width of element */
  z-index: -1;
}
.elongated-border-curve .items:nth-of-type(n+2):after {
  border-radius: 0% 35% 35% 0% / 0% 50% 50% 0%;
}
.shorter-border-curve .items:nth-of-type(n+2):after {
  border-radius: 0% 20% 20% 0% / 0% 50% 50% 0%;
}
.items:last-of-type {
  border-radius: 0%;
}
.opaque-bg .items:first-of-type {
  background: sandybrown;
  color: white;
}
.semi-transparent-bg .items:first-of-type {
  background: rgba(0, 0, 0, 0.5);
  color: white;
}
.opaque-bg .items:nth-of-type(n+2):after {
  box-shadow: 0px 0px 0px 200px wheat;
}
.semi-transparent-bg .items:nth-of-type(n+2):after {
  box-shadow: 0px 0px 0px 200px rgba(127, 127, 127, 0.5);
}

/* just for demo */
h3 {
  clear: both;
}
.opaque-bg, .semi-transparent-bg {
  padding-bottom: 50px;
}
body {
  background: radial-gradient(circle at 50% 50%, aliceblue, mediumslateblue);
  min-height: 500px;
}

<h3>Items have a solid opaque background + Elongated Border Curves</h3>
<div class='opaque-bg elongated-border-curve'>
  <div class='items'>Item 1</div>
  <div class='items'>Item 2</div>
  <div class='items'>Item 3</div>
  <div class='items'>Item 4</div>
</div>

<h3>Items have a solid semi-transparent background + Elongated Border Curves</h3>
<div class='semi-transparent-bg elongated-border-curve'>
  <div class='items'>Item 1</div>
  <div class='items'>Item 2</div>
  <div class='items'>Item 3</div>
  <div class='items'>Item 4</div>
</div>

<h3>Items have a solid opaque background + Shorter Border Curves</h3>
<div class='opaque-bg  shorter-border-curve'>
  <div class='items'>Item 1</div>
  <div class='items'>Item 2</div>
  <div class='items'>Item 3</div>
  <div class='items'>Item 4</div>
</div>

<h3>Items have a solid semi-transparent background + Shorter Border Curves</h3>
<div class='semi-transparent-bg  shorter-border-curve'>
  <div class='items'>Item 1</div>
  <div class='items'>Item 2</div>
  <div class='items'>Item 3</div>
  <div class='items'>Item 4</div>
</div>

动态宽度样本：

.items {
  float: left;
  height: 50px;
  width: 32%;
  margin-right: -10%;
  line-height: 50px;
  text-align: center;
  border: 1px solid brown;
}
.elongated-border-curve .items {
  border-radius: 0% 35% 35% 0% / 0% 50% 50% 0%;
}
.shorter-border-curve .items {
  border-radius: 0% 20% 20% 0% / 0% 50% 50% 0%;
}
.items:first-of-type {
  z-index: 3;
}
.items:nth-of-type(n+2) {
  position: relative;
  border-left: 0;
  overflow: hidden;
}
.items:nth-of-type(n+2):after {
  position: absolute;
  content: '';
  height: 100%;
  width: 100%;
  top: 0px;
  left: -69%;  /* -(parent's margin-right) - width of element */
  z-index: -1;
}
.elongated-border-curve .items:nth-of-type(n+2):after {
  border-radius: 0% 35% 35% 0% / 0% 50% 50% 0%;
}
.shorter-border-curve .items:nth-of-type(n+2):after {
  border-radius: 0% 20% 20% 0% / 0% 50% 50% 0%;
}
.items:last-of-type {
  border-radius: 0%;
}
.opaque-bg .items:first-of-type {
  background: sandybrown;
  color: white;
}
.semi-transparent-bg .items:first-of-type {
  background: rgba(0, 0, 0, 0.5);
  color: white;
}
.opaque-bg .items:nth-of-type(n+2):after {
  box-shadow: 0px 0px 0px 999px wheat;
}
.semi-transparent-bg .items:nth-of-type(n+2):after {
  box-shadow: 0px 0px 0px 999px rgba(127, 127, 127, 0.5);
}

/* just for demo */
h3 {
  clear: both;
}
.opaque-bg, .semi-transparent-bg {
  padding-bottom: 50px;
}
body {
  background: radial-gradient(circle at 50% 50%, aliceblue, mediumslateblue);
  min-height: 500px;
}

<h3>Items have a solid opaque background + Elongated Border Curves</h3>
<div class='opaque-bg elongated-border-curve'>
  <div class='items'>Item 1</div>
  <div class='items'>Item 2</div>
  <div class='items'>Item 3</div>
  <div class='items'>Item 4</div>
</div>

<h3>Items have a solid semi-transparent background + Elongated Border Curves</h3>
<div class='semi-transparent-bg elongated-border-curve'>
  <div class='items'>Item 1</div>
  <div class='items'>Item 2</div>
  <div class='items'>Item 3</div>
  <div class='items'>Item 4</div>
</div>

<h3>Items have a solid opaque background + Shorter Border Curves</h3>
<div class='opaque-bg  shorter-border-curve'>
  <div class='items'>Item 1</div>
  <div class='items'>Item 2</div>
  <div class='items'>Item 3</div>
  <div class='items'>Item 4</div>
</div>

<h3>Items have a solid semi-transparent background + Shorter Border Curves</h3>
<div class='semi-transparent-bg  shorter-border-curve'>
  <div class='items'>Item 1</div>
  <div class='items'>Item 2</div>
  <div class='items'>Item 3</div>
  <div class='items'>Item 4</div>
</div>

我认为box-shadow方法应该适合你的情况。如果没有，那么唯一的另一个选择就是使用SVG。clip-path可以在不使用SVG的情况下帮助实现这一点，但目前它对浏览器的支持非常差。