FIDDLE
HTML
<div id="DiamondCenter">
<div id="triangle-topleft"></div>
</div>
CSS
#DiamondCenter {
position:fixed;
top:2%;
left:48%;
background: #24201a;
height:40px;
width:40px;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
z-index:20 !important;
}
#triangle-topleft {
width: 0;
height: 0;
border-top: 40px solid gray;
border-right: 40px solid transparent;
}
解决方法
使用SVG：
在使用SVG时,您可以使用路径和折线元素来绘制所需的形状.正如Paulie_D在评论中指出的那样,SVG是这种复杂形状而不是CSS的更好选择(尽管这也可以用CSS实现).
方法很简单,如下：
>顶部多边形的一个路径元素,通过连接坐标(0,50),(50,0),(100,50)和(50,70)处的点绘制.
>底部多边形的另一个路径元素,通过连接(0,70)和(100,50)处的点绘制.
>橙色边框的一条折线元素,只不过是连接(0,50)的线.
svg {
height: 100px;
width: 100px;
}
path#top {
fill: gray;
}
path#bottom {
fill: black;
}
polyline#border {
stroke: orange;
stroke-width: 2;
fill: none;
}
<svg viewBox="0 0 100 100"> <path id="top" d="M0,50 L50,0 100,50 50,70z" /> <path id="bottom" d="M0,100 100,70z" /> <polyline id="border" points="0,70 100,50" /> </svg>
使用CSS：
您可以使用2个旋转和倾斜的伪元素来实现所提供的形状.使用毕达哥拉斯定理计算每个伪元素的维数.
使用此方法生成的形状具有响应性,可以适应尺寸的变化.将形状悬停在代码段内以查看其如何适应.
*,*:after,*:before {
Box-sizing: border-Box;
}
#DiamondCenter {
position: fixed;
top: 2%;
left: 48%;
background: #24201a;
height: 40px;
width: 40px;
transform: rotate(45deg);
z-index: 20 !important;
overflow: hidden;
}
#DiamondCenter:after {
position: absolute;
content: '';
bottom: 0px;
left: -1px; /* half the width of border-left */
height: calc(100% / 1.414);
width: calc(100% / 1.414);
background: black;
border-left: 2px solid orange;
transform: rotate(40deg) skewX(-20deg);
transform-origin: bottom left;
}
#DiamondCenter:before {
position: absolute;
content: '';
top: -1px; /* half the width of border-top */
right: 0px;
height: calc(100% / 1.414);
width: calc(100% / 1.414);
background: black;
border-top: 2px solid orange;
transform: rotate(-40deg) skewY(-20deg);
transform-origin: top right;
}
/* Just for demo */
#DiamondCenter{
transition: all 1s;
}
#DiamondCenter:hover{
top: 5%;
height: 80px;
width: 80px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script> <div id="DiamondCenter"></div>
在下面的代码片段中,我为伪元素设置了不同的背景颜色,以说明如何实现形状.
*,*:before {
Box-sizing: border-Box;
}
#DiamondCenter {
position: fixed;
top: 2%;
left: 48%;
background: #24201a;
height: 40px;
width: 40px;
transform: rotate(45deg);
z-index: 20 !important;
overflow: hidden;
}
#DiamondCenter:after {
position: absolute;
content: '';
bottom: 0px;
left: -1px;
height: calc(100% / 1.414);
width: calc(100% / 1.414);
background: seagreen;
border-left: 2px solid orange;
transform: rotate(40deg) skewX(-20deg);
transform-origin: bottom left;
}
#DiamondCenter:before {
position: absolute;
content: '';
top: -1px;
right: 0px;
height: calc(100% / 1.414);
width: calc(100% / 1.414);
background: skyblue;
border-top: 2px solid orange;
transform: rotate(-40deg) skewY(-20deg);
transform-origin: top right;
}
/* Just for demo */
#DiamondCenter{
transition: all 1s;
}
#DiamondCenter:hover{
top: 5%;
height: 80px;
width: 80px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script> <div id="DiamondCenter"></div>
