* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: #fff;
    background: #333;
    overflow: hidden;
}

.landing {
    position: relative;
    background-image: url('../img/background.png');
    background-size: cover;
    background-position: center;
    height: 100vh;
}


.landing-inner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    text-align: center;
    padding-top: 50px;
}

.langing h1 {
    font-size: 50px;
}

.landing p {
    font-size: 20px;
}
.landing img {
    height: 200px;
    width: 200px;
}

.countdown {
    font-size: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.countdown div {
    padding: 20px;
    border: 1px solid #fff;
    border-radius: 10px;
    margin-left: 5px;
    opacity: 0.7;
    background: #000;
}

.countdown div:first-child {
    background: #17a2b8;
}

.countdown span {
    display: block;
    font-size: 25px;
}

@media(max-width: 650px) {
    .landing img {
        height: 200px;
        width: 200px;
        /*you could also leave it as a % as well*/
    }
    .landing h1 {
        font-size: 40px;
    }

    .countdown {
        font-size: 30px;
        flex-direction: column;
    }

    .countdown div {
        display: none;
    }
    .countdown div:first-child {
        display: block;
        width: 80%
        padding: 10px;
    }


@media(max-height: 600px) {
    img {
        height: 200px;
        width: 200px;
        /*you could also leave it as a % as well*/
    }
    p {
        display: none;
    }
}

@media(max-height:400px) {
    img {
        height: 200px;
        width: 200px;
        padding-bottom: 30px;
        /*you could also leave it as a % as well*/
    }
    h1 {
        display: none;
    }
}