body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 100px;
    text-align: center;
    background: linear-gradient(to right, lightblue, lightgreen);
}

.container {
    padding: 40px 30px 20px 30px;
    background-color: white;
    width: 90%;
    max-width: 400px;
    margin: auto;
    border-radius: 50px;
}

input {
    font-size: 15px;
    width: 80%;
    padding: 15px;
    border: 3px solid grey;
    border-radius: 15px;
}

@media (max-width: 600px) {
  body {
    padding: 50px 20px;
  }

  input {
    font-size: 14px;
    padding: 12px;
  }
}

@media (max-width: 500px) {
  body {
    padding: 40px 20px;
  }

  .container {
    width: 90%;
    padding: 30px 15px 20px 15px;
  }

  input {
    width: 80%;
    font-size: 14px;
    padding: 12px;
  }
}

@media (max-width: 300px) {
  input {
    width: 80%;
    font-size: 13px;
    padding: 10px;
  }
}