Particles effect using the html css and js

#canvas {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2;
    pointer-events: none;
}

.title {
    font-size: 2.5rem;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(139, 92, 246, 0.8);
    color: #8b5cf6;
    opacity: 0;
    transition: opacity 2s ease;
    margin-bottom: 20px;
    text-align: center;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0;
    transition: opacity 2s ease;
    text-align: center;
    max-width: 80%;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

.cta {
    position: absolute;
    bottom: 5%;
    font-size: 1.4rem;
    font-weight: bold;
    color: #8b5cf6;
    opacity: 0;
    transition: opacity 1s ease;
    text-align: center;
    z-index: 5;
    width: 100%;
    text-shadow: 0 0 10px rgba(139, 92, 246, 0.8);
}

.overlay-touch {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 10;
    opacity: 0;
    pointer-events: all;
    cursor: pointer;
}