style.css

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

body {
  background: goldenrod;
  margin: 0 80px;
}

#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
  background: rgba(199, 28, 28, 0.795);
  border: 5px solid rgb(62, 122, 39);
  border-radius: 15px;
  padding: 50px;
  box-shadow: 0 0 15px 5px #2c3e50;
}

#app h3 {
  color: white;
  margin-bottom: 60px;
  font-size: 1.5rem;
  text-transform: uppercase;
}

#app p {
  color: goldenrod;
  font-size: 1.2rem;
  font-weight: 900;
}

.christmas {
  padding: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

 #app button {
  width: 50px;
  height: 50px;
  padding: 10px;
  margin: 10px 0;
  color: white;
  font-weight: 900;
  font-size: 1.3rem;
  background: rgb(62, 122, 39);
  border: none;
  border-radius: 50%;
  box-shadow: 0 0 8px 2px black;
  cursor: pointer;
}