h1, h2, h3 {
    font-family: arial, calibri, serif;
    text-align: center;
    text-decoration-line: underline;
}
h4 {
    font-family: arial, calibri, serif;
    text-align: center;
}
body{
    font-family: arial, calibri, serif;
}
#header {
    margin: auto;
    padding: 15px;
    width: 80%;
    border-bottom: solid 3px grey;
    background-color: gray;
}
#main {
    width: 80%;
    border: solid 2px grey;
    margin: auto;
    transform: translateY(20px);
    border-radius: 5px;
    padding: 10px;
}