body{
    margin: 0;
    background: linear-gradient(to left bottom,
    rgb(186, 45, 45),rgb(52, 80, 146),
    rgb(55, 142, 55),rgb(181, 181, 67));
    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,.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,.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,.3);
    border-color: rgba(255,255,255,.6);
    text-transform: uppercase;
    width: 300px;
    color: darkgreen;
}

.btn:hover{
    background-color: rgba(255,255,255,.5);
    box-shadow: 0 4px 4px rgba(0,0,0,.3);
    transition:all 300ms ease;
}