.circle {
    border-radius: 50%;
    width: 34px;
    height: 34px;
    padding: 10px;
    background: #fff;
    border: 2px solid #3687ce;
    color: #000;
    text-align: center;
    font: 32px Arial, sans-serif;
}

body {
    height: 100vh;
    margin: 0;
}

/* Trick */
body {
    display: flex;
    flex-direction: column;
}

footer {
    min-height: 80px;
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}