css样式弹跳的loading

HTML:

　　CSS:

/* 
* 1、 #232e6d
* 2、 #006cb4
* 3、 #61dafb
* 4、 #30d268
* 5、 #4fc08d
*/

* {
    padding: 0;
    margin: 0;
}

html, body {
    height: 100%;
    width: 100%;
}

.loading {
    position: fixed;
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(255, 255, 255, .9);
    z-index: 10;
}

ul {
    height: 200px;
    list-style: none;
}

li {
    float: left;
    width: 7px;
    height: 10px;
    margin: 3px;
    border-radius: 20px;
}

li:nth-child(1) {
    background-color: #232e6d;
    animation: dance 1s infinite;
    
}

li:nth-child(2) {
    background-color: #006cb4;
    animation: dance 1s infinite;
    animation-delay: .2s;
}

li:nth-child(3) {
    background-color: #61dafb;
    animation: dance 1s infinite;
    animation-delay: .4s;
}

li:nth-child(4) {
    background-color: #30d268;
    animation: dance 1s infinite;
    animation-delay: .6s;
}

li:nth-child(5) {
    background-color: #4fc08d;
    animation: dance 1s infinite;
    animation-delay: .8s;
}

@keyframes dance {
    50% {
        height: 30px;
        transform: translateY(-15px);
    }
    100% {
        height: 10px;
        transform: translateY(0px);
    }
}