style.css

* {
    margin: 0;
}

header {
    width: 100%;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

img {
    position: absolute;
    min-width: 100%;
    min-height: 100%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.6;
}

h1 {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 40px;
    font-family: 'Courier New', Courier, monospace;
    text-shadow: 0 0 6px white;
}

.dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%)
}

.dots span {
    display: inline-block;
    background-color: #000;
    margin: 0 20px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    box-shadow: 0 0 0 5px white;
}

.dots span.active {
    box-shadow: 0 0 0 5px white, 0 0 3px 10px red;
}