body {
    height: 100vh;
    font-size: 20px;
    color: white;
    background-color: rgb(15, 23, 42);
    display: flex;
    flex-direction: column;
    margin: 0;
    user-select: none;
    font-family: Arial, Helvetica, sans-serif;
}
button {
    color: white;
    cursor: pointer;
    background-color: rgb(35, 50, 84);
    line-height: 1.5;
    border-radius: 3px;
    border: 1px solid darkgray;
    font-size: 40px;
    padding: 7px 15px;
    margin: 15px;
}
.a-button {
    text-align: center;
    text-decoration: none;
    color: white;
    cursor: pointer;
    background-color: rgb(35, 50, 84);
    line-height: 1.5;
    border-radius: 3px;
    border: 1px solid darkgray;
    font-size: 40px;
    padding: 7px 15px;
    margin: 15px;
}
a {
    display: block;
}
.invisible {
    display: none;
}

/* main */
#main-banner {
    height: 100px;
    text-align: center;
    align-content: center;
    background-color: rgb(35, 50, 84);
    border-bottom: 1px solid darkgray;
    font-size: 50px;
}

#home {
    display: flex;
    flex-direction: column;
}
#home.invisible {
    display: none;
}
#projects > div {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    max-height: 600px;
    width: 900px;
    font-size: 30px;
}
.back-to-home {
    cursor: pointer;
    position: absolute;
    top: 120px;
    left: 20px;
}