* {
    margin: 0;
    padding: 0;
    box-sizing: content-box;
}

header {
    position: relative;
    width: 100%;
    height: 100vh;
    background: url(bg.jpg);
    background-size: cover;
    animation: animate 2s linear infinite;
}

@keyframes animate {
    0% {
        filter: hue-rotate(0deg);
    }

    100% {
        filter: hue-rotate(360deg);
    }
}

header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url(rain.png);
    animation: rain 0.2s linear infinite;
}

@keyframes rain {
    0% {
        background-position: 0 0;
    }

    100% {
        background-position: 20% 100%;
    }
}

header .text {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 350px;
    height: 50px;
    background: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: translate(-50%, -50%);
    border-radius: 5px;
}

header .text h3 {
    color: #000000;
    font-size: 1.5em;
    text-transform: uppercase;
    letter-spacing: 0.2px;
    font-weight: 700;
}