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

.main-nav {
    margin-top: 10px;
    list-style: none;
    padding-left: 0;
    background-color: #13a4a4;
}

.main-nav-item{
    display: inline-block;
    border-right: 1px solid #ffffff;
}

.main-nav-item a{
    color: white ;
    padding: 2px 8px;
    text-decoration: none;
    border-radius: 2px;

}

.main-nav-item a:hover{
    color: blue
}

.main-nav-item a:active{
    color: chocolate
}

main{
    width: 98%px;
    height: 500px;
    border: 10px solid grey;
}