body {
    margin:0;
    background:linear-gradient(to left bottom, lightblue, lightpink, lightblue);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family:monospace;
}

.container {
    background-color: rgba(255,255,255,.3);
    padding:20px;
    box-shadow:0 6px 10px rgba(0,0,0,0.3);
    border-radius:15px;
    width:85%;
    text-align:center;
    color:darkgreen;
}

.heading {
    font-size:35px;
    font-weight: 200;
    font-family:Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
    text-shadow: 5px 5px 2px rgba(0,0,0,0.3);
    letter-spacing: 2px;
}

.joke {
    font-size:25px;
    font-weight:500;
    margin:40px;
}

.btn {
    font-size:18px;
    font-weight:700;
    border-radius:5px;
    cursor:pointer;
    padding:10px;
    background-color: rgba(255,255,255,0.3);
    border-color:rgba(255,255,255,0.6);
    text-transform: uppercase;
    width:300px;
    color:darkgreen;
}

.btn:hover {
    background-color: rgba(255,255,255,0.6);
    box-shadow:0 4px 4px rgba(0,0,0,0.3);
    transition: all 300ms ease;
}