body {
    height: 100vh;
    width: 100vw;
    font-family: verdana, geneva, sans-serif;
    margin: 0;
    padding: 0;
    background-image: url("leaves.png");
}

a {
    color: inherit;
}

.circle {
    background-color: #ccc;
    border: 1px solid #888;
    border-radius: 50%;
    display: inline-block;
    /*box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.2);*/
    height: 30vh;
    width: 30vh;
    margin: 10vh;
    line-height: 30vh;
    font-family: verdana, geneva, sans-serif;
    font-size: 6vh;
    text-decoration: none;
}
.circle:hover {
    box-shadow: 0 0 12px rgba(0, 127, 255, 0.5);
}

.half {
    height: 50%;
    margin: 0;
    padding: 0;
    text-align: center;
    /*border: 1px solid deeppink;*/
}