div {
    
    font-size: 2vw;
}

.header_logo {
    display: flex;
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 8vw;
    background-color: beige;
    min-width: 320px;

}
.header_logo div{
    flex: 1;
}
.logo{
    display: flex;
    justify-content:flex-start;
    align-items:center;
}
.logo img{
    height: 5vw;
    margin:1vw;
}
.list_main {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    flex-wrap: wrap;
    margin-top: 8vw;
}
.grade {
    display: flex;
    flex-direction: column;
    width: 15rem;
    padding: 10px;
}
h2 {
    width: 5rem;
    font-size: 3rem;
}
.list{   
    font-size: 1rem;
}    
li {
    border: 1px solid #111 ;
    border-radius: 10px;
    margin: 5px;
    padding: 3px;
    font-size: 1rem;
}