style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-image: url(./img/background_image.jpg);
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
}
.container {
  background-color: rgba(0, 0, 0, 0.507);
  width: 93%;
  margin: 10px auto;
  color: white;
  font-family: "Kanit", sans-serif;
  text-align: center;
}

span {
  color: red;
}

form {
  text-align: left;

  margin-left: 20em;
  margin: auto;
  padding: 2%;
  display: inline-block;
  background-color: rgba(0, 0, 0, 0.669);
  /font-size: 10px;
}
#name,
#age,
#email {
  height: 2em;
  padding: 2.5%;
  width: 98%;
  margin: 2% 0;
  font-weight: 200;
}
#content-type {
  width: 90%;
}

button {
  background-color: red;
  color: white;
  border-radius: 13px;
  width: 7em;
  height: 2em;
  margin-left: 30%;
}