.rect {
position:fixed;
    padding:0px;
    margin:0px;

    top:0px;
    left:0px;

    width: 100%;
    height: 100%;
  
}
.sbtn {
  background-color: yellow;

  outline: none;
  border: 2px solid black;
  font-size: 1.1em;
  border-radius: 5px;
  margin-left: 53px;
  margin-top: 20px;
}
.sbtn:hover {
  transform: scale(1.1);
}
.box {
  height: 90px;
  width: 100px;
  background-color: grey;
  outline: none;
  border: 2px solid black;
  font-size: 1.1em;
  border-radius: 5px;
  margin-left: 70px;
  margin-top: 30px;
  font-weight: bold;
}
.white-text-with-blue-shadow {
  text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #fff, 0 0 20px #49ff18,
    0 0 30px #49ff18, 0 0 40px #49ff18, 0 0 55px #49ff18, 0 0 75px #49ff18;
  color: #ffffff;
  background: #232323;
  font: 1.3em Georgia, serif;
}
.left {
  width: 31%;
  height: 565px;
  float: left;
  margin: 5px;
  border: 3px solid RGB(128, 255, 0);
  border-radius: 15px;
  background-color: #1a1a1a;
}
.main {
  width: 28%;
  height: 480px;
  float: left;
  padding: 0px 10px;
  margin: 5px;

  border: 3px solid white;
  border-radius: 15px;
  background-color: #444747;
}
.right {
  width: 30%;
  height: 71%;
  float: left;
  padding: 5px;
  margin: 5px;

  border: 3px solid RGB(128, 255, 0);
  border-radius: 15px;
  color: white;
  background-color: #1a1a1a;
}
.number {
  font-weight: bold;
  padding: 62px 12px;
}
.wronganswer {
  color: #ff0000 !important;
}