将一个三角形点添加到使用CSS更改内容高度的div？

另一个答案,使用渐变和伪元素

#one {height: 100px;}
#two {height: 200px;}
.corner {
    width: 100px;
    background-color: green;
    margin: 10px;
    position: relative;
}
.corner:after, .corner:before {
    content: "";
    position: absolute;
    left: 100%;
    width: 40px;
    height: 50%;
}
.corner:before {
    top: 0px;
    background: linear-gradient(to top right, green 50%, transparent 51%);
}
.corner:after {
    bottom: 0px;
    background: linear-gradient(to bottom right, green 50%, transparent 51%);
}