.select {
  width: 20%;
  box-shadow: 0 0 3px 0 rgba(0, 0, 0, 0.3);
  background-color: #fff;
  padding: 20px;
  margin: 8% auto 0;
  text-align: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  
}
button {
  width: 100%;
  padding: 10px;
  border-radius: 20px;
  font-size: 15px;
  margin: 10px 0;
  border: none;
  outline: none;
  cursor: pointer;
  background-color: #21afde;
  box-shadow: 3px;
}
body {
  margin: 0;
  padding: 0;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  height: 100%;
  overflow: hidden;
  width: 100%;
}
.selectsubject {
  background-color: #1c8adb;
  color: #fff;
}

img {
  width: 70px;
  margin-top: -50px;
}
body,
html {
  height: 100%;
}
h1 {
  color: #1c8adb;
}
.correct {
  color: rgb(29, 197, 29);
  font-size: 60px;
}
.incorrect {
  color: rgb(255, 0, 0);
  font-size: 60px;
}
form {
  overflow: hidden;
}
input {
  float: left;
  clear: both;
}