the effect is as follows
reference:
A handful of codepen.
this is more expensive to write in CSS, so you can design and give you a picture instead.
for example, you define four span, then use positioning, and then set their borders to display
css
.rect {
position: absolute;
top: 20px;
left: 20px;
width: 100px;
height: 100px;
text-align: center;
line-height: 100px;
background: linear-gradient(to left, -sharpf00, -sharpf00) left top no-repeat,
linear-gradient(to bottom, -sharpf00, -sharpf00) left top no-repeat,
linear-gradient(to left, -sharpf00, -sharpf00) right top no-repeat,
linear-gradient(to bottom, -sharpf00, -sharpf00) right top no-repeat,
linear-gradient(to left, -sharpf00, -sharpf00) left bottom no-repeat,
linear-gradient(to bottom, -sharpf00, -sharpf00) left bottom no-repeat,
linear-gradient(to left, -sharpf00, -sharpf00) right bottom no-repeat,
linear-gradient(to left, -sharpf00, -sharpf00) right bottom no-repeat;
background-size: 1px 20px, 20px 1px, 1px 20px, 20px 1px;
}
html
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