.square, .circle {
    width: 100px;
    height: 100px;
    display: block;
}

.circle {
    border-radius: 50%;
}

#blockRed {
    background-color: red;
    position: static;
    margin: 20px auto;
    top: 200px;
    left: 200px;
}
#blockYellow {
    background-color: yellow;
    position: static;
    margin: 20px auto;
}

#container {
    background-color: black;
    width: 100%;
    height: 600px;
}

#blockWood {
    background-image: url('wood.jpeg');
}

body {
    background-image: url(wood.jpeg);
}

/* Button */ 

.buttons {
    list-style-type: none;
}

.buttons a {
    background-color: white;
    color: black;
    border: 4px solid black;
    border-radius: 25px;
    padding: 15px;
    text-align: center;
    text-decoration: none;
    display: block;
    width: 200px;
    margin: auto;
    margin-bottom: 30px;
    text-transform: uppercase;
    font-family: sans-serif;
    font-weight: bold;
    transition: background-color 0.4s, border 0.4s, color 0.4s;
}

.buttons a:hover{
    background-color: black;
    color: white;
    border: 4px solid white;
    border-radius: 25px;
    padding: 15px;
    text-align: center;
    text-decoration: none;
    display: block;
    width: 200px;
    margin: auto;
    margin-bottom: 30px;
    text-transform: uppercase;
    font-family: sans-serif;
    font-weight: bold;
}