*{
    padding: 0;
    margin: 0;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}
header{
    background-color: teal;
    padding: 30px;
    color: white;
}
main{
    width: 100vw;
}
a{
    display: inline-block;
    background-color: lightgray;
    padding: 10px;
    border: 1px black solid;
    border-radius: 15px;
    font-size: 22px;
    width: 100px;
    margin: 10px;
}
a:hover{
    background-color: gray;
}
#parentdiv{
    width:100vw;
    text-align: center;
}