#canvas1{
    border: 5px solid black;
    width: 600px; height: 600px; /* specified also in js */
    /* to center: */
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
}

#pause_menu, #game_over_menu{
    /* to center */
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);

    font-size: 2.5em;
    font-weight: bold;
    background-color: rgba(128, 128, 128, 0.791);
    padding: 1em;
    width: 90%;
    text-align: center;
    display: none;
}

#game_over_menu{
    background-color: rgba(185, 0, 0, 0.876);
    color: white;
}

#controls{
    width: fit-content;
    padding: 1%;
    margin: 1%;
    margin-left: auto; 
    margin-right: 2%;
    border: dashed 1px black;
}
.slider{
    width: 15em;
}

.slider::-moz-range-thumb , .slider::-webkit-slider-thumb {
    background-color: black;
    cursor: pointer;
  }