css简单实现带箭头的边框
普通边框
<style>
.border {
width: 100px;
height: 50px;
border: 1px solid red;
}
</style>
<div class="border"></div>
实现由四个三角形组成的正方形
<style>
.triangle {
width: 0;
height: 0;
border: 100px solid red;
border-right-color: green;
border-left-color: blue;
border-top-color: black;
}
</style>
<div class="triangle"></div>
向下三角形
<style>
.triangle-bottom {
width: 0;
height: 0;
border: 100px solid transparent;
border-top-color: red;
}
</style>
<div class="triangle-bottom"></div>
将左右下边颜色设置为透明 transparent,得到向下的箭头
将三角形放入边框中
<style>
.border-triangle {
width: 100px;
height: 50px;
border: 1px solid red;
position: relative;
}
.border-triangle:before {
content: "";
position: absolute;
width: 0;
height: 0;
border: 4px solid transparent;
border-top-color: red;
left: 50%;
margin-left: -4px;
bottom: -8px;
}
</style>
<div class="border-triangle"></div>
将三角形设置为绝对定位,利用margin-left和left 定位到元素中间,bottom设置-8px,靠近边框底部居中
带箭头的边框
<style>
.border-triangle-bottom {
width: 100px;
height: 30px;
border: 1px solid #1d9cd6;
position: relative;
border-radius: 4px;
}
.border-triangle-bottom:after,
.border-triangle-bottom:before {
content: "";
position: absolute;
width: 0;
height: 0;
border: 4px solid transparent;
border-top-color: #1d9cd6;
left: 50%;
margin-left: -4px;
bottom: -8px;
}
.border-triangle-bottom:after {
border-top-color: #fff;
bottom: -7px;
}
</style>
<div class="border-triangle-bottom"></div>
将边框颜色换成好看的蓝色,将before和after伪元素都设置为绝对定位,定位到边框底部剧中,将after伪元素设置成白色,底部偏移量大于before 1px,遮住三角形底部的颜色。这样一个好看的箭头边框就实现了
原文地址:https://www.cnblogs.com/homehtml/p/11833993.html
时间: 2024-10-11 05:09:41