style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  }
  body {
    background-color:rgb(19, 251, 208)

  }
  .head {
    margin-top: 1rem;
  }
  .box {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 3rem;
  }
  .form {
    display: flex;
    align-items: center;
    flex-direction: column;
    background-color: rgb(175, 174, 174);
    width: 600px;
    height: 500px;
    box-shadow: 2px 4px 10px gray;
    border: 1px solid black;
    border-radius: 20px;
    padding: 20px;
  }
  .input {
    padding: 10px 15px;
    border: 2px solid rgba(0, 0, 0, 0.4);
    font-size: 18px;
    outline: none;
    border-radius: 10px;
    background-color: rgba(111, 73, 73, 0.02);
  }
  label {
    font-size: 18px;
    letter-spacing: 1.4px;
  }
  .tableForm {
    margin-top: 10px;
  }
  .btn {
    background-color: rgb(200, 206, 25);
    color: white;
    padding: 10px 20px;
    font-size: large;
    font-weight: 600;
    border-radius: 10px;
  }
  
  input:invalid:focus {
    border: 2px solid red;
  }
  
  .table {
    background-color: rgb(73, 73, 239);
    border: 2px solid black;
    margin: 40px auto;
  }
  
  .td,
  .th {
    padding: 10px;
    text-align: center;
  }
  
  .subHead {
    text-align: center;
    margin-top: 2rem;
  }