index.css

body {
    background-image: linear-gradient(-45deg, #2177b8 0%, #c35691 50%, #2177b8 100%);
    background-size: 300% 300%;
    animation: hhh 5s infinite both linear;
    /* infinite表示动画一直循环播放
    both表示动画效果，应该同时应用于元素的进入和离开过程
    linear表示动画会匀速进行 */
}
@keyframes hhh {
    0% {
        background-position: 300% 300%;
    }

    33% {
        background-position: 200% 200%;
    }

    66% {
        background-position: 100% 100%;
    }

    100% {
        background-position: 0% 0%;
    }
}
.hello{
    position: absolute;
    width: 500px;
    height: 300px;
    background-color:rgba(255,228,196,0.7);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -90%);/* 向右x，向下y */
    border-radius:20px;
} 
.author{
    box-sizing: border-box;
    position: fixed;
    top: 100px;
    height: 60px;
    width: 230px;
    background-color:orange;
    margin-left: -390px;
    padding-top: 17px;
    border-radius: 10px;
}
.newpage {
    padding-left: 13px;
    text-decoration: none;
    font-size: 20px;
}
a:hover {
    color: black;
}

.button{
    position: fixed;
    width: 500px;
    height: 100px;
    top: 330px;
}
.inbutton{
    width: 200px;
    height: 80px;
    border: 0;
    border-radius:10px;
    font-size: 2rem;
    color: rgba(0,0,0,0.7);
    cursor: pointer;
}
.left{
    float: left; 
    background-color:rgb(250,143,113);
}
.left:hover{
    background-color:rgba(250,143,113,0.7);
}
.right{
    float: right;
    background-color:rgb(129,214,207);
}
.right:hover {
    background-color: rgba(129,214,207,0.7);
}
.makenot{
    position: fixed;
    width: 500px;
    height: 100px;
    top: 450px;
    left: 0;

    border: 0;
    border-radius: 10px;
    font-size: 2rem;
    color: rgba(0, 0, 0, 0.7);
    background-color:rgb(248,232,174);

    cursor: pointer;
}


.word{
    font-size: 50px;
}
#map0{
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translate(-50%, -50%);
}
#map1{
    margin-left: 30px;
    font-size: 20px;
}

.notlist{
    position: fixed;
    width: 250px;
    height: 600px;
    top: -50px;
    left: 670px;
    border-radius: 10px; 
    padding: 10px;
    background-color: rgba(255, 228, 196, 0.7);
    overflow-y: scroll;/* 滚轮 */
}

.now{
    position: fixed;
    width: 450px;
    height: 100px;
    top: 230px;
    left: -495px;
    border-radius: 10px;

    background-color: rgb(254,167,141);
}
.nownum{
    padding-left: 13px;
    font-size: 30px;
    font-weight: 300;
}

.x{
    width: 40px;
    height: 20px;
    border: 0;
    border-radius: 5px;
    background-color:rgb(230,206,230);
    cursor: pointer;
}

.change{
    width: 80px;
    height: 50px; 
    border-radius: 10px;
    cursor: pointer;
    box-sizing: border-box;
    padding-left: 23px;
    padding-top: 12px;
    color: snow;
}

.junior{ 
    position: fixed;
    top: 420px;
    left: -480px;
    background-color: #de283b;
}
.senior{
    position: fixed;
    top: 420px;
    left: -370px;
    background-color: #ff6366;
}
.cet4{
    position: fixed;
    top: 420px;
    left: -260px;
    background-color: #FFD700;
}
.cet6{
    position: fixed;
    top: 420px;
    left: -150px;
    background-color: #00E5FF;
}
.postgraduate{
    position: fixed;
    top: 500px;
    left: -425px;
    background-color: #c69fff;
}
.toefl{
    position: fixed;
    top: 500px;
    left: -315px;
    background-color: #ff8e8c;
}
.sat {
    position: fixed;
    top: 500px;
    left: -205px;
    background-color: #86efac;

    padding-left: 25px;
}