body {
    margin: 0;
    background-color: #000;
    user-select: none;
    font-family: monospace;
    overflow: hidden;
}

a {
    text-decoration: none;
    color: #ffa;
}
#copyright {
    position: absolute;
    left: 0;
    bottom: 0px;
    width: 100%;
    height: 24px;
    border-radius: 6px;
    font-size: 20px;
    background: rgba(100, 100, 150, 0.75);
    padding-left: 16px;
    color: white;
}

#btn1,
#btn2,
#btn3,
#btn4,
#btn5 {
    position: absolute;
    top: 8px;
    width: 64px;
    height: 50px;
    border-radius: 20px;
    font-size: 3em;
    text-align: center;
    background: rgba(100, 200, 100, 0.75);
}

#btn1 {
    left: 8px;
}

#btn2 {
    left: 80px;
}

#btn3 {
    left: 152px;
}
#btn4 {
    left: 224px;
}
#btn5 {
    left: 296px;
}

#sv {
    position: absolute;
    top: 68px;
    width: 350px;
    height: 38px;
    left: 8px;
    border-radius: 20px;
    font-size: 28px;
    text-align: center;
    background: rgba(100, 100, 200, 0.75);
}