6款好看的边框动画

边框效果1

代码

css

.div1 {
    width: 300px;
    height: 200px;
    position: relative;
    border: 1px solid #0b7ffe;
}

.div1::before,
.div1::after {
    content: "";
    position: absolute;
    width: 30px;
    height: 30px;
    animation: div1Ani 1500ms infinite linear;
}

.div1::before {
    top: -5px;
    left: -5px;
    border-top: 1px solid #0b7ffe;
    border-left: 1px solid #0b7ffe;
}

.div1::after {
    right: -5px;
    bottom: -5px;
    border-bottom: 1px solid #0b7ffe;
    border-right: 1px solid #0b7ffe;
}

@keyframes div1Ani {
    0% {
        width: 30px;
        height: 30px;
    }
    50% {
        width: calc(100% + 9px);
        height: calc(100% + 9px);
    }
    100% {
        width: 30px;
        height: 30px;
    }
}

html

    通过before，after设置对角两个div，并且设置对应的两个边框。
    hover改变before，after的大小，并设置过渡，达到最终效果

边框效果2

代码

css

.div2 {
    width: 300px;
    height: 200px;
    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: 10px 2px, 10px 2px, 2px 10px, 2px 10px;
    background-position: 0 0, 0 100%, 0 0, 100% 0;
    animation: div2Ani 500ms infinite linear;
}

@keyframes div2Ani {
    100% {
        background-position: 10px 0, -10px 100%, 0 -10px, 100% 10px;
    }
}

html

    通过设置背景过渡颜色实现虚线，通过background-size控制虚线宽度大小。
    background-position指定4条背景的位置。
    通过动画设置background-position达到运动效果

边框效果3

代码

css

.div3 {
    width: 300px;
    height: 200px;
    position: relative;
    overflow: hidden;
}

.div3::after {
    content: '';
    position: absolute;
    left: -50%;
    top: -50%;
    width: 200%;
    height: 200%;
    background-repeat: no-repeat;
    background-size: 50% 50%, 50% 50%;
    background-position: 0 0, 100% 0, 100% 100%, 0 100%;
    background-image: linear-gradient(#399953, #399953), linear-gradient(#fbb300, #fbb300), linear-gradient(#d53e33, #d53e33), linear-gradient(#377af5, #377af5);
    animation: div3Rotate 4s linear infinite;
}

.div3 > div {
    position: absolute;
    left: 5px;
    top: 5px;
    width: calc(100% - 10px);
    height: calc(100% - 10px);
    background: #ffffff;
    z-index: 2;
    padding: 20px;
    box-sizing: border-box;
}

@keyframes div3Rotate {
    100% {
        transform: rotate(360deg);
    }
}

html

    
        大盒子超出隐藏，利用伪类设置背景颜色，通过动画旋转，
        并在盒子里面设置一个遮罩层，遮罩层比大盒子小，露出边框达到效果
    

边框效果4

代码

css

.div4 {
    width: 300px;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.div4::before {
    content: '';
    position: absolute;
    left: -50%;
    top: -50%;
    width: 200%;
    height: 200%;
    background-color: #e5e3e3;
    background-repeat: no-repeat;
    background-position: 0 0;
    background-image: conic-gradient(transparent, #343434, transparent 30%);
    animation: div4Rotate 4s linear infinite;
}

.div4 > div {
    position: absolute;
    left: 5px;
    top: 5px;
    width: calc(100% - 10px);
    height: calc(100% - 10px);
    background: #ffffff;
    z-index: 2;
    padding: 20px;
    box-sizing: border-box;
}

@keyframes div4Rotate {
    100% {
        transform: rotate(360deg);
    }
}

html

    
        大盒子超出隐藏，利用伪类设置背景颜色过渡，通过动画旋转，
        并在盒子里面设置一个遮罩层，遮罩层比大盒子小，露出边框达到效果
    

边框效果5

代码

css

.div5 {
    width: 300px;
    height: 200px;
    position: relative;
    color: #fff;
    border: 2px solid gold;
    border-radius: 10px;
    background: #ffd700;
    transition: all .3s;
}

.div5::before {
    content: "";
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border: 2px solid #ffd700;
    border-radius: 10px;
    animation: div5Ani 3s infinite linear;
}

.div5::after {
    content: "";
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border: 2px solid #ffd700;
    border-radius: 10px;
    animation: div5Ani 3s infinite linear;

}

@keyframes div5Ani {
    0%,
    100% {
        clip-path: inset(0 0 98% 0);
    }

    25% {
        clip-path: inset(0 98% 0 0);
    }
    50% {
        clip-path: inset(98% 0 0 0);
    }
    75% {
        clip-path: inset(0 0 0 98%);
    }
}

.div5::after {
    animation: div5Ani 3s infinite -1.5s linear;
}

html

    通过clip-path属性，对伪类进行裁剪，而伪类是支持圆角边框的，通过规则的动画去裁剪，达到运动效果

边框效果6

代码

css

.div6{
    width: 300px;
    height: 200px;
    position: relative;
    margin: auto;
    overflow: hidden;
    border: 5px solid;
    border-image: linear-gradient(45deg, gold, deeppink) 1;
    clip-path: inset(0px round 5px);
    animation: div6Ani 3s infinite linear;
    filter: hue-rotate(360deg);
}
@keyframes div6Ani {
    0% {
        filter: hue-rotate(0deg);
    }
    100% {
        filter: hue-rorate(360deg);
    }
}

html

    边框border-image属性，颜色过渡，设置过渡动画，色调旋转滤镜，裁剪圆角，达到最终效果

demo https://yuan30-1304488464.cos.ap-guangzhou.myqcloud.com/blog/files/0db12b39c54d47009f3637fe9a06de94.html