style.css

body {
  background: linear-gradient(to bottom right, #00b4db, #0083b0);
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.box {
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.3);
  padding: 20px;
}

input[type="text"] {
  width: 100%;
  height: 50px;
  font-size: 24px;
  border-radius: 5px;
  border: none;
  padding: 10px;
  margin-bottom: 20px;
}

button {
  display: inline-block;
  background-color: #00b4db;
  color: #fff;
  border: none;
  border-radius: 25px;
  font-size: 18px;
  padding: 10px 20px;
  cursor: pointer;
  margin-right: 10px;
}

#copiar {
  background-color: #0083b0;
}

@media screen and (max-width: 600px) {
  .box {
    width: 80%;
    height: 300px;
  }
  
  input[type="text"] {
    width: 90%;
    height: 50px;
    font-size: 28px;
  }
  
  button {
    padding: 12px 24px;
    font-size: 20px;
  }
}