style.css

body {
    font: 'Raleway', sans-serif;
    color: rgba(0, 0, 0, .5);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: .5em;
    top: 15%;
    background: fixed no-repeat linear-gradient(to right, #05f005, #0505f0);
}

h1 {
    font: 600 3.5em 'Raleway', sans-serif;
    letter-spacing: .5em;
    width: 100%;
}

h3 {
    font: 900 1em 'Raleway', sans-serif;
    text-transform: none;
    letter-spacing: 0.01em;
}

.background-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.copy-icon {
    width: 20px;
    margin-left: 6px;
}

.copy-icon:hover {
    cursor: copy;
}

.tooltip {
    position: relative;
}

.tooltip .tooltip-text {
    visibility: hidden;
    background-color: black;
    color: #fff;
    font-size: 0.8em;
    letter-spacing: 0.2em;
    text-align: center;
    text-transform: none;
    border-radius: 6px;
    padding: 4px;
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -60px;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
}