html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

body {
    background: url('back.jpg') no-repeat center center fixed;
    background-size: cover;
}

.wave-container {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: #6ba3ff;
}

.wave {
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.5) 25%, transparent 26%);
    background-size: 50px 50px;
    animation: wave-animation 4s linear infinite;
    opacity: 0.6;
}

@keyframes wave-animation {
    0% {
        transform: translateX(0) translateY(0);
    }
    50% {
        transform: translateX(-25px) translateY(-25px);
    }
    100% {
        transform: translateX(-50px) translateY(-50px);
    }
}