* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;

}

.container {
    width: 90%;
    margin: 10px auto;
    position: relative;
}

.container img {
    position: absolute;
    transition: 0.3s;
}

body {
    font-family: "PingFang SC", "Microsoft Yahei", sans-serif;
    background-color: #1e272e;
}

ul,
li {
    margin: 0;
    padding: 0;
}

nav {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 10vh;
}

ul {
    position: relative;
    display: flex;
}

ul li {
    /* 如果设置为inline-block，会有空隙 */
    /* https://stackoverflow.com/questions/19038799/why-is-there-an-unexplainable-gap-between-these-inline-block-div-elements */
    list-style: none;
    width: 120px;
    line-height: 40px;
    text-align: center;
}

ul li a {
    color: white;
    text-decoration: none;
}

.slider {
    width: 100px;
    height: 40px;
    background-color: #5352ed;
    border-radius: 4px;
    position: absolute;
    left: 10px;
    bottom: 0;
    z-index: -1;
    transition: all ease 0.4s;
    animation: 2s ease-in-out waves infinite;
}

li:nth-child(1):hover ~ .slider {
    left: 10px;
}

li:nth-child(2):hover ~ .slider {
    left: 128px;
}

li:nth-child(3):hover ~ .slider {
    left: 248px;
}

li:nth-child(4):hover ~ .slider {
    left: 368px;
}

li:nth-child(5):hover ~ .slider {
    left: 488px;
}

@keyframes waves {
    from {
        clip-path: polygon(
                0% 17%,
                9% 10%,
                18% 4%,
                30% 0%,
                43% 1%,
                49% 4%,
                57% 7%,
                66% 10%,
                78% 11%,
                89% 11%,
                96% 9%,
                100% 7%,
                100% 100%,
                0% 100%
        );
    }
    50% {
        clip-path: polygon(
                0% 4%,
                6% 9%,
                13% 13%,
                23% 15%,
                31% 16%,
                42% 15%,
                49% 13%,
                61% 10%,
                71% 5%,
                81% 3%,
                90% 2%,
                100% 5%,
                100% 100%,
                0% 100%
        );
    }
    to {
        clip-path: polygon(
                0% 17%,
                9% 10%,
                18% 4%,
                30% 0%,
                43% 1%,
                49% 4%,
                57% 7%,
                66% 10%,
                78% 11%,
                89% 11%,
                96% 9%,
                100% 7%,
                100% 100%,
                0% 100%
        );
    }
}

.login:hover {
    text-decoration: none;
    color: black;
    background-color: white
}

.login {
    color: white;
    text-decoration: none;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    -webkit-box-shadow: 3px 3px 3px #1e272e;
    -moz-box-shadow: 3px 3px 3px #1e272e;
    box-shadow: 3px 3px 3px #1e272e;
    background: #31414b;
    padding: 5px 15px;
}

.record {
    width: 300px;
    margin: 0 auto;
    padding: 20px 0;
}

.record a {
    display: inline-block;
    text-decoration: none;
    height: 20px;
    line-height: 20px;
}

.record p {
    float: left;
    height: 20px;
    line-height: 20px;
    margin: 0 0 0 5px;
    color: #939393;
}