body {
    background: url("../images/bg.jpg") no-repeat center center fixed; 
    background-size: cover;
}

.overlay {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    width: 25%;
    margin: 0 auto;
    margin-top: 50px;
}

.langs {
    display: flex;
    width: 100%;
    justify-content: space-between;
    align-items: center;
    margin-top: 200px;
}

.langs div {
    background: rgba(105, 17, 34, .6);
    padding: 15px;
    border-radius: 20px;
}

.langs div a {
    font-size: 40px;
    text-decoration: none;
    color: #fff;
}

@media (max-width: 576px) {
    .overlay {
        width: 80%;
    }
    .langs div a {
        font-size: 30px;
    }
}

@media (min-width: 576px) and (max-width: 768px) {
    .overlay {
        width: 70%;
    }
}

@media (min-width: 768px) and (max-width: 1200px) {
    .overlay {
        width: 50%;
    }
}