*{
    box-sizing: border-box;
}

body{
    background-color: rgb(219,237,255);
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
    padding: 20px;
}

.container{
    background-color: #fff;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    width: 600px;
    max-width: 100%;
}

h3{
    margin: 0;
    opacity: 0.5;
    letter-spacing: 2px;
}

.joke{
    font-size: 30px;
    letter-spacing: 1px;
    line-height: 40px;
    margin: 50px auto;
    max-width: 500px;
} 

.btn{
    background-color: rgb(219,237,255);
    border: 0;
    border-radius: 10px;
    color: #000;
    cursor: pointer;
    padding: 14px 40px; 
    font-size: 16px;
}

.btn:active{
    transform: scale(0.97);
}

.btn:focus{
    outline: 0;
}