}@charset "utf-8";
/* CSS Document */
fieldset{
    border:1px solid black;
    padding:10px;
    
}

.quesHolder {
	background-color: #cfe2f3;
    margin-left:5px;
    margin-top: 5px;
    border:1px solid black;
    padding:12px;
}

h1{
    font-size: 2em;
    color: #345a8a;
}

h2{
    font-size: 1.5em;
    color: #345a8a;
}

h3{
    background-color: #d8ead2;
    text-align: center;
    border:1px solid black;
}
img{margin-left:20px;}
li{margin-left:30px;}
td,tr,th{text-align: center; border:1px solid black;}


[type='checkbox'] + label, [type='radio'] + label {
    display: inline-block;
    margin-left: 0;
    margin-right: 0;
    margin-bottom: 0;
    vertical-align: baseline;
}

.fbs{
    font-size: 1.5em;
    color: #345a8a;
}

.ques p:first-child {
	font-weight: bold;
}


.submit, .showAns, .showNext {
    background-color: #4b4b4b;
    color: #ffffff;
    padding: 12px;
    width:102%;
     margin-top:15px;
}

.submit:hover, .showAns:hover, .showNext:hover {
    background-color: #0E598B;
    color: #ffffff;
    padding: 12px;
}

.submit:focus, .showAns:focus, .showNext:focus {
    outline: gold 1px solid;
}


#calculateIt {
	opacity: .5;
}

.seperate {
	border-bottom: 2px dashed black;
}

.gapTop {
	margin-top: 15px;
}


down vote
You can use css

input[disabled]
{
    background-color:black;