* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  font-family: Arial;  
  background: linear-gradient(to top left, #5c6bc0, #90caf9);
}

header h1 {
  color: white;
  font-weight: normal;
  padding: 20px;
  letter-spacing: 0.1em;
  display: none;
}

main {
  padding: 10px;
}

main p.joke {
  font-size: 28px;
  font-family: ;
  letter-spacing: 0.1em;
  color: white;
  margin-bottom: 30px;
}

button {
  -webkit-appearance: button;
  font-size: 16px;
  padding: 10px 20px;
  background: white;
  border: none;
  cursor: pointer;
}

button:hover,
button:focus {
  background: lightgray;
}

footer {
  font-size: 14px;
  padding: 10px;
  color: white;
}

footer a {
  text-decoration: none;
  color: lightgray;
}

footer a:hover {
  text-decoration: underline;
  color: #fff;
}