body{
  background: #777;
  font-family: Arial, Helvetica, sans-serif;
  width: 100vw;
  height: 100vh;
}
#wrapper{
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;    
}
h1{
font-size: 45px;
line-height: 80px;
font-weight: bold;
text-shadow: 1px 1px 1px gold;
}
/* display opening screen */
#splash{
  display: block;
  /* display: block; */
  width: 500px;
  height: 500px;
  border: 5px solid gold;
  border-radius: 5%;
  background: #444;
}
#difficulty{
  font-size: 40px;
  background: saddlebrown;
  color: gold;
  float: left;
  margin-top: 50px;
  margin-left: 20px;
  outline: none;
}
#card-choice{
  font-size: 40px;
  background: saddlebrown;
  color: gold;
  float: right;
  margin-top: 50px;
  margin-right: 20px;
  outline: none;
}
#start-quiz{
  font-size: 40px;
  padding-top: 40px;
  margin: 200px auto;
  line-height:70px;
  text-align: center;
  color: antiquewhite;
  background: saddlebrown;
  width: 200px;
  height: 200px;
  border: 3px solid gold;
  box-shadow: 5px 5px 5px grey;
  border-radius: 25%;
}
#start-quiz:hover{
  color: red;
  box-shadow: none;
  background: #ccc;
}
/* main screen */
#flash-cards{
  display:none;
  /* display: block; */
  width: 500px;
  height: 500px;
  border: 5px solid gold;
  border-radius: 5%;
  background: #444;
}
#cards-header{
  display: flex;
  flex-direction: row;
  justify-content: space-evenly;
  align-items: center;
  color: antiquewhite;
  font-size: 20px;
  margin-top: 25px;
}
.divider-solid{
  width: 80%;
  border: 5px solid grey;
  margin: 10px auto;
}
#cards-body{
  display: flex;
  flex-direction: column;
  align-items: center;
  color: antiquewhite;
  text-shadow: 1px 1px 1px black;
  font-size: 30px;
}
.question{
  background: saddlebrown;
  padding: 20px 20px;
  border-radius: 10%;
  margin-bottom: 10px;
  color: antiquewhite;
  text-shadow: 1px 1px 1px black;
}
.choice{
  margin: 12px;
  color: antiquewhite;
  text-shadow: 1px 1px 1px black;
}
.choice:hover{
  color: red;
}
#cards-footer{
  height : 50px;
  width : 200px;
  text-align: center;
  color: antiquewhite;
  margin: 0 auto;
}
#counter{
  font-size: 35px;
  text-shadow: 1px 1px 1px black;
}
#btimeGauge{
  width : 150px;
  height : 10px;
  border-radius: 10px;
  background: lightgray;
  margin-left : 25px;
}
#timeGauge{
  width: 70px;
  height : 10px;
  border-radius: 10px;
  background: mediumseagreen;
  margin-top : -10px;
  margin-left : 25px;
}

/* final finish screen */
#finish{
  display: none;
  /* display: flex; */
  flex-direction: column;
  justify-content: space-evenly;
  align-items: center;
  width: 500px;
  height: 500px;
  border: 5px solid gold;
  border-radius: 5%;
  background: #444;
  color: antiquewhite;
  text-shadow: 1px 1px 1px black;
  font-size: 40px;
}
.cards-question-numbers-finish{
  font-size: 30px;
}
#restart{
  background: saddlebrown;
  padding: 15px;
  border: 3px solid gold;
  border-radius: 25%;
  box-shadow: 5px 5px 5px grey;
}
#restart:hover{
  color: red;
  background: #ccc;
  box-shadow: none;
}
/* cell phone configuration */
@media only screen and (max-width: 550px){
  h1{
    padding-left: 60px;
    font-size: 35px;
  }
  #splash, #flash-cards, #finish{
    width: 95%;
    margin-left: 50px;
  }
  #cards-header{
    font-size: 17px;
  }
  .cards-question-numbers-finish{
    font-size: 25px;
  }
}