style.css

/* Following Css statements are to enhance the user-interface of the JavaScript Form Validation site*/

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Quicksand', sans-serif;  
  background: linear-gradient(to bottom, white, rgb(226, 255, 211));
}

body {
  box-sizing: border-box;
  width: 100%;
  height: 100vh;
}

#form {
  width: 500px;
  margin: 20px auto;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 10px;
  margin-top: 40px;
  /* background-color: white; */
}

h2 {
  text-align: center;
}

.input-group {
  margin-bottom: 10px;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

input[type="text"], 
input[type="email"], 
input[type="tel"], 
input[type="password"] 
{
  width: 97%;
  padding: 5px;
  border: 1px solid #ddd;
  border-radius: 5px;

}

.error {
  color: red;
  margin-top: 5px;
  display: none;
}

input[type="submit"] {
  width: 100%;
  padding: 10px;
  background-color: rgb(122, 253, 122);
  color: #fff;
  font-weight: bolder;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  margin-top: 10px;
}

.footer {
  background-color: black;
  color: white;
  text-align: center;
  margin-bottom: -55px;
  padding: 10px;
  position: absolute;
  bottom: 0;
  width: 100%;
}

.footer a {
  color: rgb(122, 253, 122);
  text-decoration: none;
}

@media (max-width: 767px) {
  #form {
    width: 85%;
    margin-left: 15px;
    margin-right: 15px;
    padding-left: 25px;
    padding-right: 25px;
  }

  input[type="text"], 
  input[type="email"], 
  input[type="tel"], 
  input[type="password"] 
  {
    margin-left: 5px;
    margin-right: 5px;
  }
}