*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: "Open Sans", sans-serif;
    font-size: 16px;
    font-weight: 300;
    color: #fff;
    background-color: #111;
}

a,
button {
    font: inherit;
    color: inherit;
}

header {
    margin-bottom: 100px;
    text-align: center;
}

input {
    position: absolute;
    opacity: 0.01;
    transform: scale(0.01);
}

label {
    padding: 1.5em 5em;
    font-size: 18px;
    font-weight: 700;
    text-align: center;
    text-transform: uppercase;
    color: #333;
    background-color: #ffeb3b;
    cursor: pointer;
}

input:focus + label,
label:hover {
    box-shadow:
        0 0 0 5px #111,
        0 0 0 10px #ffeb3b;
}

label span {
    display: block;
    margin-top: 0.25em;
    font-size: 0.85em;
    font-weight: 300;
    text-transform: initial;
}

label span:empty {
    display: none;
}