/* definición de variables de colores */
* {
    box-sizing: border-box;
    transition: all 0.5s;
}

body {
    width: 99%;
    height: 100%;
    display: grid;
    place-items: center;
    background-color: rgb(87, 87, 87);
}
canvas {
    border: 2px #333 solid;
    background-color: #eee;
    background-image: url(../img/wallspace.jpg);
    back     
    background-size: cover;
    background-position: 50%;
}

#audio {
    display: none;
}

#iniciar {
    position: absolute;
    font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
    color: #f00;
    background-color: #efefef;
    border: none;
    border-radius: 10px;
    top: 300px;
    width: 200px;
    height: 40px;
    font-size: 1.5rem;
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.5);
}

#iniciar:hover {
    color: #efefef;
    background-color: #f00;
}