*{
    padding: 0px;
    margin: 0px;
    box-sizing: border-box;
}
h1{
    background-color: black;
    text-align: center;
    font-size: 40px;
    color: red;
    padding: 10px;
    margin: auto;
}
main{
    height:auto;
}

main > ul > li{
    background-color: tomato;
    width: 100px;
    height: 100px;
}
main > ul{
    list-style-type: none;
}