*{
    padding: 0px;
    margin: 0px;
    box-sizing: border-box;
}
body{
    background-color: lightsteelblue;
}
header>h1, header > h2{
    color: red;
    background-color: darkblue;
    text-align: center;
    font-family:'Courier New', Courier, monospace;
    padding: 0px 20px;
}
header > h1{
    font-size: 3rem;
}
header > h2{
    font-size: 2rem;
}
nav > ul{
    list-style-type: none;
    display: flex;
    flex-direction: column;
}
nav>ul>li{
    width: 100%;
}
nav>ul>li>a{
    background-color: lightgray;
    display: block;
    text-align: center;
    padding: 10px 0px;
    border: black solid 1px;
}
nav>ul>li>a:active{
    background-color: darkgrey;
}

main{
    height: 500px;
    background-color: darkcyan;
}
main>article{
    padding: 10px 15px;
}
main > ul{
    list-style-type: none;
    height: 450px;
    background-color: blueviolet;

    display: flex;
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    align-content: space-between;
    gap: 20px 40px
}
main > ul > li{
    background-color: orange;
    font-size: larger;
    font-weight: 900;
    height: 100px;
    width: 100px;
}
footer{
    background-color: lightcyan;
}