body {
    background-color: #483D8B;
    color: white;
    font-family: sans-serif;
}

canvas {
    padding-left: 0;
    padding-right: 0;
    margin-left: auto;
    margin-right: auto;
    display: block;
    width: 60%;
    height: 60%;
}

.screen {
    display: none;
}

.screen.active {
    display: block;
}

.screen h1, .screen h2 {
    text-align: center;
}

.screen h1 {
    font-size: 500%;
}

.container {
    display: flex;
    flex-direction: column;
}

.div-center-block {
    padding-left: 0;
    padding-right: 0;
    margin-left: auto;
    margin-right: auto;
    display: block;
    width: 60%;
}

button {
    background-color: #2b2b2b;
    border: none;
    color: white;
    padding: 10px 22px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 12px;
    margin: 4px 2px;
    cursor: pointer;
}

@media(max-width:767px) {
    .div-center-block {
        width: 100%;
    }
    canvas {
        width: 100%;
        height: 100%;
    }
    .screen h1 {
        font-size: 200%;
    }
}