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

:root{
    --color1: #252525;
    --color2: #292929;
    --color3: #1F1F1F;
    --color4: #4C4C4C;
    --color5: #747373;
}

body{
    background: var(--color3);
    overflow-x: hidden;
}

header{
    position: fixed;
    width: 100%;
    height: 60px;
    background: var(--color1);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

header .menu{
    position: absolute;
    top: 0;
    left: 0;
    width: 30px;
    height: 4px;
    margin: 30px 20px;
    background: var(--color4);
    box-shadow: 0 -8px 0 var(--color4),
                0  8px 0 var(--color4);
    border-radius: 20px;
    cursor: pointer;
}

header ul{
    position: absolute;
    top: 5px;
    right: 10px;
    width: 500px;
    height: 50px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    cursor: pointer;
}
header ul li{
    list-style: none;
    width: 40px;
    height: 40px;
    background: var(--color2);
    margin: 8px;
    border-radius: 50%;
    justify-content: center;
}

section{
    position: relative;
    width: 100%;
}

.sidemenu{
    position: fixed;
    top: 60px;
    width: 240px;
    height: 100%;
    background: var(--color2);
}

.main{
    position: absolute;
    top: 60px;
    left: 200px;
    width: calc(100% - 200px);
    margin: 20px 60px;
    display: flex;
    flex-wrap: wrap;
}

.main .contant{
    position: relative;
    width: 290px;
    height: 250px;
    margin: 0 10px;
    margin-bottom: 40px;
}

.main .contant .video{
    position: relative;
    width: 100%;
    height: 180px;
    background: var(--color2);
    cursor: pointer;
}
.detail{
    position: absolute;
    bottom: 0;
    left: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}
.detail .img{
    position: absolute;
    bottom: 20px;
    left: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color2);
    cursor: pointer;
}
.detail .title{
    position: absolute;
    top: 0;
    left: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.title h1{
    position: absolute;
    bottom: 20px;
    left: -10px;
    width: 210px;
    height: 20px;
    background: var(--color2);
    border-radius: 2px;
    margin: 20px 60px;
    cursor: pointer;
}

.title h1:last-child{
    position: absolute;
    bottom: -10px;
    left: -10px;
    width: 120px;
}

::-webkit-scrollbar{
    width: 10px;
}
::-webkit-scrollbar-track{
    background: var(--color3);
}
::-webkit-scrollbar-thumb{
    background: var(--color5);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover{
    background: var(--color4);
}