style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  body {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(rgb(123, 184, 104), rgb(13, 87, 10));
    font-size: 2rem;
    font-family: sans-serif;
    color: rgb(7, 9, 10);
  }
  .container {
    height: 20rem;
    width: 15rem;
    background-color: rgb(152, 228, 165);
    text-align: center;
    padding-top: 12px;
    border-radius: 16px;
    border: 2px solid rgb(14, 43, 1);
  }

  .placeholder{
    margin-right: 750px;
  }

  .input{
    padding: 15px;
  }

  input[type="text"] {
    height: 3.5rem;
    width: 20rem;
    background: #fff;
    font-weight: bold;
    font-size: 1.1rem;
    padding: 10px;
    border: none;
    background-color: transparent;
    border: 2px solid #c2c2c2;
    border-radius: 2px;
    margin-right: 4px;
  }

  .btn{
    height: 3.2rem;
    width: 6.5rem;
    background: #03a776;
    font-weight: bold;
    color: #fff;
    font-size: 1.2rem;
    margin-top: 20px;
    border: none;
    border-radius: 5px;
  }