.header {
    top: 0;
    left: 110px;
    position: fixed;
    background-color:rgb(240, 240, 240);
    overflow: hidden;
    width: 100%;
    height: 50px;
    opacity: 0.9;
    z-index: 1;
}

.header h1 {
    font-size: 20px;
    padding-left: 20px;
    font-family: Arial, Helvetica, sans-serif;
}

.sidenav {
    height: 100%;
    width: 110px;
    position: fixed;
    z-index: 2;
    top: 0;
    left: 0;
    background-color: #545454;
    overflow-x: hidden;
    padding-top: 20px;
}

.sidenav a {
    padding-top: 20px;
    padding-left: 15px;
    text-decoration: none;
    color: #818181;
    font-size: 20px;
    font-family: Arial, Helvetica, sans-serif;
    display: block;
}

.sidenav a:hover{
    color: #f1f1f1;
}

.inputField { grid-area: top;}
.grid { grid-area: middle; }
.sets { grid-area: middle-right; }

.main {
    margin-top: 50px;
    margin-left: 140px;
    padding: 20px 15px;
    font-family: Arial, Helvetica, sans-serif;
    display: grid;
    grid-template-areas:
        'top top'
        'middle middle-right';
    grid-gap: 10px;
}

.main > div {
    padding: 10px;
}

.sets {
    align-self: start;
    min-width: 550px;
}

.main h1 {
    font-size: 20px;
}

.main h2 {
    padding-top: 20px;
    font-size: 20px;
}

.button_select {
    font-size: 16px;
    text-decoration: none;
    background-color: #EEEEEE;
    color: black;
    padding: 2px 6px 2px 6px;
    border-top: 0.5px solid black;
    border-right: 0.5px solid black;
    border-bottom: 0.5px solid black;
    border-left: 0.5px solid black;
    position: relative;
    top: 15px;
}

.my_prime td {
    border: 1px solid black;
    font-size: 15px;
    text-align: center;
    width:20px;
    height:20px;
    padding: 10px;
}

.about {
    padding-left: 150px;
}