半透明边框
border:10px solid hsla(0, 0%, 100%,.5);
background-clip:padding-box;
缝边效果
outline: 1px white dashed;
outline-offset:-10px;
border-radius:4%;
background:#795548;
边框内圆角
// 思路如下：为元素设置圆角，外层设置轮廓outline。圆角与直角之间的空隙用阴影补齐，阴影的尺寸为圆角半径的一半
border-radius:10px;
background: tan;
outline:10px solid #655;
box-shadow:0 0 0 5px #655;
信封边框
信封边框有两种实现思路：
- 使用背景渐变
padding:1em;
border: 1em solid transparent;
background: linear-gradient(white,white) padding-box,repeating-linear-gradient(-45deg, red 0, red 12.5%, transparent 0, transparent 25%, #58a 0, #58a 37.5%, transparent 0, transparent 50%) 0/5em 5em;
- 使用边框图片
padding:1em;
border: 1em solid transparent;
border-image:repeating-linear-gradient(-45deg, red 0, red 1em, transparent 0, transparent 2em, #58a 0, #58a 3em, transparent 0, transparent 4em) 16;
脚注效果
//由于使用了currentColor，它会根据color属性的变化而自动适应
padding-top:1em;
border-top: .2em solid transparent;
border-image: 100% 0 0 linear-gradient(90deg,currentColor 4em,transparent 0);
蚂蚁线
@keyframes ants{100%{background-position:100%;}}
div{
width:200px;
height: 70px;
border: 1px solid transparent;
background: linear-gradient(white,white) padding-box,repeating-linear-gradient(-45deg, black 0, black 25%, white 0, white 50%) 0/.6em .6em;
animation:ants 12s linear infinite;
}
