body {
  background: linear-gradient(to left bottom, lightblue, lightpink, lightblue);
  min-height: 100vh;
  margin: 0;
  padding: 2.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

.container {
  background-color: rgba(255, 255, 255, 0.3);
  padding: 5rem;
  box-shadow: 0 4px 10px rgb(0, 0, 0, 0.3);
  border-radius: 15px;
  -webkit-border-radius: 15px;
  -moz-border-radius: 15px;
  -ms-border-radius: 15px;
  -o-border-radius: 15px;
  width: 65%;
  text-align: center;
  color: darkslateblue;
}

.heading {
    font-size: 36px;
    font-weight: 200;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
    text-shadow: 2px 2px 2px rgb(0,0,0,.3);
    letter-spacing: 2px;
}

.joke {
    font-size: 26px;
    font-weight: 400;
    margin: 40px;
}

.btn {
    font-size: 18px;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    padding: 10px;
    background-color: rgb(255,255,255,.3);
    border-color: rgb(255,255,255,.6);
    text-transform: uppercase;
    width: 300px;
    color: darkslateblue;
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    -ms-border-radius: 8px;
    -o-border-radius: 8px;
}

.btn:hover {
    background-color: rgb(255,255,255,.5);
    box-shadow: 0 4px 4px rgba(0,0,0,0.3);
    transition: all 300ms ease;
    -webkit-transition: all 300ms ease;
    -moz-transition: all 300ms ease;
    -ms-transition: all 300ms ease;
    -o-transition: all 300ms ease;
}