*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font: 14px Arial,sans-serif;
	margin: 0;
    }
.header {
    padding: 15px 20px;
    background: #40494D;
    color: white;
    }
.header h1 {
    font-size: 24px;
    }
.container {
    width: 100%;
    background: #f2f2f2;
    }
.nav, .section {
    float: left;
    padding: 20px;
    min-height: 170px;
    box-sizing: border-box;
    }
.nav {
    width: 20%;
	height:725px;
    background: #d4d7dc;
    }
.section {
    width: 80%;
	height:725px;
    text-align: center;
    background-image: url("image2.jpg");
	background-repeat:no-repeat;
	background-size: cover;
    background-size: 100% 100%;
    }
.nav ul {
    list-style: none;
    padding: 0px;
    margin: 0px;
    }

.clearfix:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
    }
.footer {
    background: #acb3b9;
    text-align: center;
    padding: 5px;
    }

.var h1{
    text-align: center;
    box-sizing: border-box;
    border: 2px ridge black;
    background:#E5E4E2;
    }


#table{
	position:absolute;
	top:430px;
	left:650px;
}

#weight_machine{
	position:absolute;
	top:380px;
	left:790px;
}

#flask{
	position:absolute;
	top:132px;
	left:840px;
}

#salt{
	position:absolute;
	top:329px;
	left:848.5px;
}

#time{
	text-align:center;
	position:absolute;
	top:433.5px;
	left:850px;
	font-size:24px;
	color:orange;
}

#led{
	position:absolute;
    top:432px;
	left:961px;
}


dummydeclaration { padding-left: 4em; } /* Firefox ignores first declaration for some reason */
tab0 { padding-left: 1em; }
tab1 { padding-left: 4em; }
tab2 { padding-left: 8em; }
tab3 { padding-left: 12em; }
tab4 { padding-left: 16em; }
tab5 { padding-left: 20em; }
tab6 { padding-left: 2em; }
tabw { padding-left: 3em; }
tabo { padding-left: 2.5em; }
tabc { padding-left: 3em; }
tab7 { padding-left: 10.5em; }
tab8 { padding-left: 11.5em; }


#power_button{
  background-color: #545D61;
  border: none;
  color: white;
  padding: 8px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 19px;
  margin: 4px 2px;
  cursor: pointer;
}

#weight_button{
  background-color: #545D61;
  border: none;
  color: white;
  padding: 8px 27px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 19px;
  margin: 4px 2px;
  cursor: pointer;
}

#table_button{
  background-color:#545D61;
  border: none;
  color: white;
  padding: 8px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 19px;
  margin: 4px 2px;
  cursor: pointer;
}

#calc_button{
  background-color: #545D61;
  border: none;
  color: white;
  text-align: center;
  padding: 8px 49px;
  text-decoration: none;
  display: inline-block;
  font-size: 19px;
  margin: 4px 2px;
  cursor: pointer;
}

#reset{
  background-color: #545D61;
  border: none;
  color: white;
  text-align: center;
  padding: 8px 71px;
  text-decoration: none;
  display: inline-block;
  font-size: 19px;
  margin: 4px 2px;
  cursor: pointer;
}


#calc_centre{
  position:absolute;
	width:900px;
	height:550px;
	background:white;
}

#result_table{
	position:absolute;
}

#ok_btn{
	background-color: #545D61;
  border: none;
  color: white;
  padding: 25px 45px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 15px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius:20%;
}

table, th, td {
  border: 3px solid black;
  border-collapse: collapse;
}

#questions{
  height:100%;
  width:70%;
  top:5px;
  position:absolute;
  margin: 0 ;
  font-size: 16px;
  //background-color: #cffffe;
  font-family: 'Montserrat', sans-serif;
  font-weight: 400;
}

.custom-box{
  max-width: 700px;
  background-color: #ffffff;
  margin:40px auto;
  padding:30px;
  border-radius: 10px;
}
.custom-box::before,
.custom-box::after{
  content: '';
  clear: both;
  display: table;
}
.custom-box.hide{
  display: none;
}

.home-box{
  font-size: 18px;
  color: #000000;
  font-weight: 500;
  margin-bottom: 15px;
  line-height: 25px;
}

.home-box h3 {
  font-size: 16px;
  margin-bottom: 10px;
  line-height: 22px;
  color: #000000;
  font-weight: 400;
}

.home-box p span{
  font-weight: 500;
}

.home-box .btn{
  margin-top: 20px;

}

#btn{
  margin-bottom:15px;
  padding: 15px 45px;
  background-color: #009688;
  color:#ffffff;
  border:none;
  border-radius: 5px;
  font-family: 'Montserrat', sans-serif;
  font-size: 16px;
  cursor: pointer;
  display: inline-block;
}

.quiz-box .question-number,
.quiz-box .question-text,
.quiz-box .option-container,
.quiz-box .next-question-btn,
.quiz-box .answers-indicator{
  width: 100%;
  float: left;
}
.quiz-box .question-number{
  font-size:18px;
  color:#009688;
  font-weight: 600;
  border-bottom: 1px solid #cccccc;
  padding-bottom: 10px;
  line-height: 25px;
}
.quiz-box .question-text{
  font-size: 22px;
  color: #000000;
  line-height: 28px;
  font-weight: 400;
  padding: 22px 0;
  margin: 0;
}

 .quiz-box .option-container .option{
  background-color: #cccccc;
  padding: 13px 15px;
  font-size: 16px;
  line-height: 22px;
  color: #000000;
  border-radius: 5px;
  margin-bottom: 10px;
  text-transform: capitalize;
  cursor: pointer;
  opacity: 0;
  animation: fadeIn 0.3s ease forwards;
  position: relative;
  overflow: hidden;
}

@keyframes fadeIn {
  0%{
    opacity: 0;
  }
  100%{
    opacity: 1;
  }
}

.quiz-box .option-container .option.correct::before{
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  background-color: green;
  z-index: -1;
  animation: slideInLeft .5s ease forwards
}
@keyframes slideInLeft {
  0%{
    transform: translateX(-100%);
  }
  100%{
    transform: translate(0%);
  }
}
.quiz-box .option-container .option.wrong::before{
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  background-color: red;
  z-index: -1;
  animation: slideInLeft .5s ease forwards
}
.quiz-box .option-container .option.wrong{
  color: #ffffff;
}
.quiz-box .option-container .option.correct::before{
  color: #ffffff;
}

.quiz-box .btn{
  margin: 15px 0;
}

.quiz-box .answers-indicator{
  border-top: 1px solid #cccccc;
}
.quiz-box .answers-indicator div {
  height: 40px;
  width: 40px;
  display: inline-block;
  background-color: #cccccc;
  border-radius: 50%;
  margin-right: 3px;
  margin-top: 15px;
}