html{
    font-size: 62.5%;
}
.x{
    border-bottom: .5rem solid rgb(128, 124, 124);
}
h1{
    font-size:7rem;
    text-align: center;
    color:  rgb(128, 124, 124);
}
.y{
    display: flex;
    justify-content: space-around;
}
.yuanliao{
    font-size: 5rem;
    color:rgb(128, 124, 124);
}
.content{
    font-size:4rem ;
    color:rgb(128, 124, 124);
    margin: 0 auto;
    text-align: center;
}