* {
    box-sizing: border-box;
}
body{
    background:
    linear-gradient(
      rgba(0, 0, 0, 0.7), 
      rgba(0, 0, 0, 0.7)
    ), 
    url(https://images.pexels.com/photos/1089438/pexels-photo-1089438.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260) repeat; 
    color: white;
    background-size: cover;
    background-position: center;
    font-family: 'Roboto', sans-serif;   
}    
li {
    list-style: none;
}
header h1{
    text-align: center;
    margin: 2.5em 0;
}
.progress-bar{
    padding:0;
    display:flex; 
    width:111%; 
    height:.5em;
    margin:-.5em auto 0 auto;
}
.single-bar{
    background-color: lightgreen; 
    border: 1px solid black; 
    width: 9%;
}
.main {
    background: rgba(0, 0, 0, 0.7);
    display:flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 50%;
    position: relative;
    margin: 0 auto;
    box-shadow: inset 0 0 7px #048632;
}
.hidden {
    display: none;
}
form {
    width: 50%;
}
.answer-chioce {
    margin-bottom: .5em;
} 
label{
    cursor: pointer;
}
.progress-score{
    display: flex;
    justify-content: flex-end;
    width: 50%;
    margin: 0 auto;
}
.progress-score li {
    padding-top: 0.5em;
    padding-left: 1em;
}
.vr-img {
    margin-bottom: 1em;
}
.img-license {
    font-size: .6em;
    position: relative;
    top: -3.5em;
    color: white;
}
.img-license a:visited{
    color: white ;
}   
 label{
    margin-left: .5em;
}
.success{
    background-color: lightgreen;
}
.failure {
    background-color: lightcoral;
}
.message{
    text-align: center;
    padding: .5em;
    box-shadow: inset 0 0 14px orangered;
}
.correct {
    color: lightgreen;
    font-size: 1.5em;
    font-weight: bold;
    text-shadow: 1px 1px 2px black;
    box-shadow: inset 0 0 17px #048632;
}
.correct-answer {
    color: #048632;  
    text-shadow:  1px 1px 3px lightgreen;
}
.wrong-answer{
    color: orangered;
    font-weight: 500;
}

 /* Buttons */
.submit-answer,
.submit-next,
.submit-start,
.submit-restart {
    width:100%;
    margin: .5em 0 1em;
} 
.correct::before {
    content: 'Correct!'
}
.submit-answer::before{
    content: 'Submit Answer';
}
.submit-next::before{
    content: 'Next';
}
.result li {
    font-size: 2em;
    font-weight: 700;   
}
button {
    background: transparent;
    box-shadow: inset 0 0 17px #B2B4B5;
    padding: 0.2em 0 0.2em;
    color: #B2B4B5;
    cursor: pointer;
    font-size: 1.2em;
    border: none;
    outline: none;
    transition: all ease-in 0.3s;
}
button:hover{
    background: #B2B4B5;
    color:black;
}
.button:active {
    box-shadow: inset 0 0 17px #B2B4B5;
}
/* buttons end */
.show-score, .final-result{
    font-size: 1.5em;
    font-family: 'Orbitron', sans-serif;
}
.final-result{
    color:lightgreen;
    padding: 0.4em;
    box-shadow: inset 0 0 17px #048632;
}
.result h2{
    font-size:1.8em;
}

/* Animations */
@keyframes glow {
    from {
      box-shadow: 0 0 10px -10px #aef4af;
    }
    to {
      box-shadow: 0 0 10px 10px #aef4af;
    }
  }
  .glow {
      animation: glow ease-in-out .5s forwards alternate;
      animation-iteration-count: 2;
  }
.fade-in {
    animation: fadeIn ease .7s;
  }
  
  @keyframes fadeIn{
    0% {
      opacity:0;
    }
    100% {
      opacity:1;
    }
  }

  /* Media queries */
  @media screen and (max-width:720px){
    body {
        font-size: 0.8em;
    }
    .main{
        width: 90%;
    }
    .progress-score{
        width: 90%;
    }
  }
  @media screen and (min-width:721px){
    .main{
        width: 70%;
    }
    .progress-score{
        width: 70%;
    }
  }
  @media screen and (min-width:1020px){
    .main{
        width: 50%;
    }
    .progress-score{
        width: 50%;
    }
  }