原文地址：https://segmentfault.com/a/1190000014807564

感想： 這個特效不難，但是這想法可能想不到，哈哈，怎麼又廢了。

HTML程式碼：

<div class="loader">
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
</div>

CSS程式碼：

html, body ,.loader
 
{
    margin: 0;
    padding: 0;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: black;
}
/* 設定span的樣式 */
.loader{
    position: relative;
    width: 10em;
    height: 10em;
    font-size: 28px;
}
.loader span{
    position: absolute
 
;
    width: 100%;
    height: 100%;
    /* 0.3表示透明度 */
    background-color: rgba(100%, 0%, 0%, 0.3);
    /* 並排 */
    box-sizing: border-box;
    border: 0.5em solid;
    /* border-color: 上下  左右 */
    border-color: white rgba(100%, 100%, 100%, 0.2);
    /* 動畫名稱 週期 節奏 迴圈次數 是否反向播放 */
    animation: animate 5s ease-in-out infinite alternate
 
;
}
@keyframes animate{
    0%{
        /* red */
        /* 顏色變換 */
        background-color: rgba(100%, 0%, 0%, 0.3);
        /* 旋轉 */
        transform: rotate(0deg);
    }
    25% {
        /* yellow */
        background-color: rgba(100%, 100%, 0%, 0.3);
    }
    50% {
        /* green */
        background-color: rgba(0%, 100%, 0%, 0.3);
    }
    75% {
        /* blue */
        background-color: rgba(0%, 0%, 100%, 0.3);
    }
    100% {
        /* purple */
        background-color: rgba(100%, 0%, 100%, 0.3);
        transform: rotate(720deg);
    }
}
/* 分別設定5個span的尺寸 */
.loader span:nth-child(1){
    width: calc(20% + 20% * (5-1));
    height: calc(20% + 20% * (5-1));
    /* 為每個span設定動畫延時 */
    animation-delay: calc(0.2s * (5-1));
}
.loader span:nth-child(2) {
    width: calc(20% + 20% * (5 - 2));
    height: calc(20% + 20% * (5 - 2));
    animation-delay: calc(0.2s * (5 - 2));
}
.loader span:nth-child(3) {
    width: calc(20% + 20% * (5 - 3));
    height: calc(20% + 20% * (5 - 3));
    animation-delay: calc(0.2s * (5 - 3));
}
.loader span:nth-child(4) {
    width: calc(20% + 20% * (5 - 4));
    height: calc(20% + 20% * (5 - 4));
    animation-delay: calc(0.2s * (5 - 4));
}
.loader span:nth-child(5) {
    width: calc(20% + 20% * (5 - 5));
    height: calc(20% + 20% * (5 - 5));
    animation-delay: calc(0.2s * (5 - 5));
}