body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: darkcyan;
    overflow: hidden;
}

div {
    font-family: sans-serif;
}

h1 {
    color: gold;
    text-align: center;
    position: relative;
}

h1::after {
    content: '?';
    position: absolute;
    top: -0.25em;
    left: -0.1em;
    font-size: 25em;
    line-height: 1em;
    transform: rotate(15deg);
    color: hsl(180, 60%, 40%);
    z-index: -1;
}

p {
    font-size: 24px;
    width: 400px;
    height: 2.5em;
    color: gold;
    border: 2px solid darkkhaki;
    line-height: 2.5em;
    text-align: center;
    border-radius: 10px;
    letter-spacing: 2px;
    word-spacing: 2px;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

p span {
    position: absolute;
    width: 100%;
    left: 0;
    transition: 0.5s cubic-bezier(0.75, 0, 0.25, 1);
}

p span.answer {
    color: whitesmoke;
    font-size: 1.1em;
    text-transform: uppercase;
    background: hsla(0, 0%, 0%, 0.1);
    left: -100%;
}

p:hover span {
    cursor: pointer;
    transform: translateX(100%);
}