body, html {
    height: 100%;
    margin: 0;
	background-color: #004080;
}

* {
    box-sizing: border-box;
}

.content {
    position: fixed;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    color: #f1f1f1;
    width: 100%;
    padding: 20px;
    z-index: 2;
}

.btn {
    border: 2px solid black;
    background-color: white;
    color: black;
    padding: 14px 28px;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
}

.eng, .rus {
    border-color: #2196F3;
    color: dodgerblue;
}

.eng:hover, .rus:hover {
    background-color: #004080;
    color: white;
}

.footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background-color: #01203f;
    color: white;
    text-align: center;
}