.box {
  width: 99.8%;
  background: #333333E6;
  border-radius: 5px;
  border: 1px solid #1F3E44;
  box-shadow: 2px 2px #1F3E44;
  margin-bottom: 17px;
} 

.big-text {
  font-size: 25px; 
  text-align: center;
  padding: 20px;
}

#guestbook { 
  width: 100%; 
  height: 500px; 
  border: none;
}