CSS border length control

CSS border length control. In the past, when the border length needed to be smaller than the container, I used p nesting. Later I found that pseudoclass is very convenient to achieve this effect. Only one p is enough. In addition, it will not be troublesome to adjust padding and margin.

border top

border left

border right

border bottom

.box-container {
    position: relative;
    width: 90%;
    color: #777;
}

.border-top {
    background: #b4bcbf;
    padding: 15px;
}

    .border-top:before {
        content: &#39;&#39;;
        position: absolute;
        left: 42%;
        top: 0;
        bottom: auto;
        right: auto;
        height: 7px;
        width: 50%;
        background-color: #8796a9;
    }

.border-left {
    background: #dfdad6;
    padding: 15px;
}

    .border-left:before {
        content: &#39;&#39;;
        position: absolute;
        left: 0;
        top: 6%;
        bottom: auto;
        right: auto;
        height: 52%;
        width: 5px;
        background-color: #a89d9e;
    }

.border-right {
    background: #eee9c4;
    padding: 15px;
}

    .border-right:after {
        content: &#39;&#39;;
        position: absolute;
        left: auto;
        top: auto;
        bottom: 5px;
        right: 0;
        height: 52%;
        width: 5px;
        background-color: #f39c81;
    }

.border-bottom {
    background: #bcdc9d;
    padding: 15px;
}

    .border-bottom:after {
        content: &#39;&#39;;
        position: absolute;
        left: 18px;
        top: auto;
        bottom: 0;
        right: auto;
        height: 6px;
        width: 105px;
        background-color: #32b66b;
    }

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The effect is as follows:
border length

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