body {
    margin: 0px;
    padding: 0;
    width: 100%;
    height: 100%;
    background-image: url("../images/wall.jpg");
    display: flex;
    justify-content: center;
    align-items: center;
}

.contenedor-principal {
  display: flex;
  justify-content: center;
  align-items: center;
}

#my_canvas {
    background: #000000;
    border: #000  solid;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.contenedor-botones {
    background-color: #fdfdfd;
    background-color: rgb(180, 181, 181);
    display: flex;
    justify-content: center;
    align-items: center;
}

.boton {
    color: rgb(255, 250, 250);
    font-size: 15px;
    background-color: #1e0081;
    cursor: pointer;
    border-radius: 55px;
    border: 2px solid blue;
    padding: 8px;
    padding-left: 8px;
    margin-left: 99px;
}

.boton:hover {
    background-color: rgb(144, 0, 0);
    color: #ffffff;
}