CSS设置边框的几个技巧

设置边框最常使用border,比如这样:

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border: 1px dashed #333;

这是最常规的方法了,今天再来说说其他两种方法,

  1. outline方式
  2. background方式

outline方法

这也算是一种比较常规的方法了,

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outline: 1px solid;

但需要注意的是,outline是在容器的最外部,与border的渲染还是有点区别的,同时对比下:

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border: 1px dashed #333;
outline: 1px solid;

外部实线是outline,内部虚线是border,为了一致,可以设置outline-offset往内缩一点:

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outline-offset: -1px;

background方法

这是本文的重点,我也是刚get到此项技能,之前一直不知道background居然如此强大,直接上代码:

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background: linear-gradient(90deg, #333 50%, transparent 0) repeat-x 0 0px/9px 1px, #ffffff;

这里我们只设置了上面看,而且还是虚线的,做一说明这种方式的强大,再把其他边框补上去:

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background: 
linear-gradient(90deg, #333 50%, transparent 0) repeat-x 0 0px/9px 1px,
linear-gradient(90deg, #333 50%, transparent 0) repeat-x 0 100%/9px 1px,
linear-gradient(0deg, #333 50%, transparent 0) repeat-y 0 0/1px 9px,
linear-gradient(0deg, #333 50%, transparent 0) repeat-y 100% 0px/1px 9px,
#ffffff;

可见,使用background非常的灵活,边框的位置可以任意调整👍。

现在我们已经掌握这几方式,但本文的重点是上面这种,我们现在来动手操练下:

渐变边框

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background: linear-gradient(90deg, #29bdd9 0%, #276ace 100%) repeat-x 0 0/100% 5px
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linear-gradient(-90deg, #29bdd9 0%, #276ace 100%) repeat-x 0 100%/100% 4px,
linear-gradient(180deg, #29bdd9 0%, #276ace 100%) repeat-y 0 0/4px 100%,
linear-gradient(0deg, #29bdd9 0%, #276ace 100%) repeat-y 100% 0/4px 100%,
#eee;

滚动虚线边框

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.box {
background:
linear-gradient(90deg, #333 50%, transparent 0) repeat-x,
linear-gradient(90deg, #333 50%, transparent 0) repeat-x,
linear-gradient(0deg, #333 50%, transparent 0) repeat-y,
linear-gradient(0deg, #333 50%, transparent 0) repeat-y;
background-size: 4px 1px, 4px 1px, 1px 4px, 1px 4px;
background-position: 0 0, 0 100%, 0 0, 100% 0;
}

.box:hover {
animation: linearGradientMove .3s infinite linear;
}

@keyframes linearGradientMove {
100% {
background-position: 4px 0, -4px 100%, 0 -4px, 100% 4px;
}
}

滚动渐变

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.box {
background:
linear-gradient(90deg, #FF8235,#30E8BF, #FF8235) repeat-x,
linear-gradient(90deg, #FF8235,#30E8BF, #FF8235) repeat-x,
linear-gradient(0deg, #FF8235,#30E8BF, #FF8235) repeat-y,
linear-gradient(0deg, #FF8235,#30E8BF, #FF8235) repeat-y;
background-size: 100% 8px, 100% 8px, 8px 100%, 8px 100%;
background-position: 0 0, 0 100%, 0 0, 100% 0;
}

.box:hover {
animation: linearGradientMove 1s infinite linear;
}

@keyframes linearGradientMove {
100% {
background-position: 200px 0, -200px 100%, 0 -200px, 100% 100px;
}
}

以上就是设置边框的几个小技巧。

参考:
https://www.cnblogs.com/coco1s/p/14291567.html