sign_up.css

/* Signup Form*/
* {box-sizing: border-box}

/* Full-width input fields */
input[type=text], input[type=password] {
  width: 100%;
  padding: 15px;
  margin: 5px 0 22px 0;
  display: inline-block;
  border: none;
  background: #f1f1f1;
}

input[type=text]:focus, input[type=password]:focus {
  background-color: #ddd;
  outline: none;
}

hr {
  border: 1px solid #f1f1f1;
  margin-bottom: 25px;
}


button {
  background-color: #06D001;
  color: white;
  padding: 14px 20px;
  margin: 8px 0;
  border: none;
  cursor: pointer;
  width: 100%;
  opacity: 0.9;
}

button:hover {
  opacity: 1;
}

.cancelbtn {
  padding: 14px 20px;
  background-color: #FF0000;
}


.cancelbtn, .signupbtn {
  float: left;
  width: 50%;
}


.container {
  padding: 16px;
}


.clearfix::after {
  content: "";
  clear: both;
  display: table;
}

@media screen and (max-width: 600px) {
  .cancelbtn, .signupbtn {
    width: 100%;
    float: none;
  }

  input[type=text], input[type=password] {
    padding: 10px;
  }

  button {
    padding: 12px;
  }
}

body {
  margin: 0;
  padding: 20px;
  background-image: url('img/back.jpg');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
}

form {
  background-color: rgba(0, 0, 0, 0.5);
  color: white;
  margin: 0 auto;
  padding: 20px;
  max-width: 500px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.container {
  padding: 0;
}

.error-message {
  color: red;
  font-size: 14px;
  margin-top: 5px;
}