body, html { 
    height: 100%; 
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #00E676; 
}

#blackhole {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    display: flex;
    z-index: 99999;
    transition: opacity 800ms ease, visibility 800ms ease;
}

#blackhole.fade-out {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.centerHover {
    width: 180px;
    height: 180px;
    background-color: #FFEB3B; 
    border: 4px solid #FFFFFF;
    border-radius: 50%;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-top: -90px;
    margin-left: -90px;
    z-index: 2;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 500ms ease;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.centerHover.open {
    opacity: 0;
    pointer-events: none;
    transform: scale(1.5);
}

.centerHover span {
    color: #1B5E20; 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 22px;
    font-weight: bold;
    letter-spacing: 2px;
    transition: all 300ms;
}

.centerHover:hover {
    transform: scale(1.05);
    background-color: #FFEE58;
}

canvas {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    display: block;
}