body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background: url('/background.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}
canvas {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    max-height: 100%;
}
.controls {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 10px;
}
.controls button {
    margin: 0 10px;
}
#pdf-canvas {
    height: 100%;
}
button {
    background-color: #dddddd90;
    color: #ffffff;
    width: 40px;
    height: 40px;
    border-radius: 100%;
    outline: none;
    border: none;
    transition: calc(0.3s);
}

button:hover {
    background-color: #dddddd50;
    transform: scale(1.1);
    transition: calc(0.3s);
}