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

body {
    font-family: 'Roboto', sans-serif;
    color: #333333;
    background-color: rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

    body * {
        box-sizing: border-box;
    }

.header {
    background: #003A51;
    border-bottom: 1px solid rgba(0, 0, 0, 0.2);
    padding: 5px 10px 10px 10px;
    height: 60px;
}

.header__img {
    color: #000000;
    display: block;
    height: 50px;
}

.container {
    display: flex;
    width: 100%;
    height: calc(100vh - 54px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    text-align: center;
    position: relative;
}

.material-icons {
    font-size: 72px;
    color: #3FC97B;
}

h1 {
    display: block;
    width: 100%;
    font-size: 64px;
    margin: 50px 0 10px 0;
}

h3 {
    display: block;
    width: 100%;
    font-size: 36px;
    color: rgba(0, 0, 0, 0.55);
    margin: 0;
    font-weight: 400;
}

.abbr {
    position: absolute;
    font-size: 300px;
    left: 0;
    bottom: 0;
    color: rgba(0,0,0,0.02);
    line-height: 250px;
    font-weight: bold;
    user-select: none;
}

@media (max-width: 767px) {
    .material-icons {
        font-size: calc(0.8 * 72px);
    }

    h1 {
        font-size: calc(0.6 * 65px);
        margin-top: 20px;
    }

    h3 {
        font-size: calc(0.6 * 36px);
    }

    .abbr {
        font-size: calc(0.6 * 300px);
        line-height: calc(0.6 * 250px);
    }
}