css 四角邊框


.rect{
  background: linear-gradient(to left, #196aa8, #196aa8) left top no-repeat,
        linear-gradient(to bottom, #196aa8, #196aa8) left top no-repeat,
        linear-gradient(to left, #196aa8, #196aa8) right top no-repeat, 
        linear-gradient(to bottom, #196aa8, #196aa8) right top no-repeat,
        linear-gradient(to left, #196aa8, #196aa8) left bottom no-repeat, 
        linear-gradient(to bottom, #196aa8, #196aa8) left bottom no-repeat,
        linear-gradient(to left, #196aa8, #196AA8) right bottom no-repeat,
        linear-gradient(to left, #196aa8, #196aa8) right bottom no-repeat;
  background-size: 1px 20px, 20px 1px, 1px 20px, 20px 1px;
}

效果如下:


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