html透明四⾓边框，给div来个酷炫的四⾓边框—linear-gradient .border1 {
background: linear-gradient(to left, rgba(51, 51, 51, 1), rgba(51, 51, 51, 1)) left top no-repeat,
linear-gradient(to bottom, rgba(51, 51, 51, 1), rgba(51, 51, 51, 1)) left top no-repeat,
linear-gradient(to left, rgba(51, 51, 51, 1), rgba(51, 51, 51, 1)) right top no-repeat,
linear-gradient(to bottom, rgba(51, 51, 51, 1), rgba(51, 51, 51, 1)) right top no-repeat,
linear-gradient(to left, rgba(51, 51, 51, 1), rgba(51, 51, 51, 1)) left bottom no-repeat,
linear-gradient(to bottom, rgba(51, 51, 51, 1), rgba(51, 51, 51, 1)) left bottom no-repeat,
linear-gradient(to left, rgba(51, 51, 51, 1), rgba(51, 51, 51, 1)) right bottom no-repeat,
linear-gradient(to left, rgba(51, 51, 51, 1), rgba(51, 51, 51, 1)) right bottom no-repeat;
/*设置⼤⼩*/
background-size: 0.15rem 0.6rem, 0.6rem 0.15rem, 0.15rem 0.6rem, 0.6rem 0.15rem;
}
.border2 {
margin: 300px auto;
width: 200px;
height: 100px;
background: linear-gradient(blue, blue) left top,
linear-gradient(blue, blue) left top,
linear-gradient(blue, blue) right top,
linear-gradient(blue, blue) right top,
linear-gradient(blue, blue) left bottom,
linear-gradient(blue, blue) left bottom,
linear-gradient(blue, blue) right bottom,
linear-gradient(blue, blue) right bottom;
background-repeat: no-repeat;
background-size: 1px 24px, 24px 1px;
}
.card{
background: radial-gradient(circle at center center, rgba(23, 48, 78, 1), rgba(20, 37, 63, 1)),
linear-gradient(rgba(179,224,255,0.62), rgba(179,224,255,0.62)) left top,
linear-gradient(rgba(179,224,255,0.62), rgba(179,224,255,0.62)) left top,
linear-gradient(rgba(179,224,255,0.62), rgba(179,224,255,0.62)) right top,
linear-gradient(rgba(179,224,255,0.62), rgba(179,224,255,0.62)) right top,
linear-gradient(rgba(179,224,255,0.62), rgba(179,224,255,0.62)) left bottom,div border属性
linear-gradient(rgba(179,224,255,0.62), rgba(179,224,255,0.62)) left bottom,
linear-gradient(rgba(179,224,255,0.62), rgba(179,224,255,0.62)) right bottom,
linear-gradient(rgba(179,224,255,0.62), rgba(179,224,255,0.62)) right bottom,
linear-gradient(rgba(56, 144, 184, 0.60), rgba(56, 144, 184, 0.60)) top,
linear-gradient(rgba(26, 87, 130, 0.60), rgba(26, 87, 130, 0.60)) bottom,
linear-gradient(rgba(56, 144, 184, 0.60), rgba(219, 240, 255, 0.80), rgba(26, 87, 130, 0.60)) left,
linear-gradient(rgba(56, 144, 184, 0.60), rgba(219, 240, 255, 0.80), rgba(26, 87, 130, 0.60)) right;
background-repeat: no-repeat;
background-position: 1px 1px, 0px 0px, 0px 0px, 0px 100%, 0px 100%, 100% 0px, 100% 0px, 100% 100%, 100% 100%, 0px 0px, 0px 100%, 0px 100%, 100% 100%;
background-size: calc(100% - 2px) calc(100% - 2px), 1px 10px, 10px 1px, 1px 10px, 10px 1px, 1px 10px, 10px 1px, 1px 10px, 10px 1px, 100% 1px, 100% 1px, 1px 100%, 1px 100%;
}

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