.btn {
    background: #3cb0fd;
    background-image: -webkit-linear-gradient(top, #3cb0fd, #3498db);
    background-image: -moz-linear-gradient(top, #3cb0fd, #3498db);
    background-image: -ms-linear-gradient(top, #3cb0fd, #3498db);
    background-image: -o-linear-gradient(top, #3cb0fd, #3498db);
    background-image: linear-gradient(to bottom, #3cb0fd, #3498db);   
    -webkit-border-radius: 3;
    -moz-border-radius: 3;
    border-radius: 3px;
    color: #ffffff;
    font-size: 20px;
    padding: 10px 20px 10px 20px;
    text-decoration: none;
    cursor: context-menu; 
    box-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}
.btn:hover { 
    background: #2196f3;  
    background-image: -webkit-radial-gradient(circle, #2196f3 80%, #0d87e9 81%);  
    background-image: -moz-radial-gradient(circle, #2196f3 80%, #0d87e9 81%);
    background-image: -ms-radial-gradient(circle, #2196f3 80%, #0d87e9 81%);
    background-image: radial-gradient(circle, #2196f3 80%, #0d87e9 81%);      
    text-decoration: none;
}
.btn:active {
    box-shadow: 0 8px 17px 0 rgba(0, 0, 0, 0.2);
    transition-delay: 0s;
}
.center {
text-align: center;
margin: 20px 0;
}
.conditionalFieldset label {
    display: inline-block;
    width: 14em;
}
.conditionalFieldset {
    display: none;
}
.equationImg {
    max-width: 100%;
    height: auto;
    margin: -20px 0 0 0;
}
.error {
    color: red;
}
.formQuestion {
    display: inline-block;
    width: 14em;
}
.help {
    display: none;
    background: #ebecd1;
    font-size: small;
    color: #777;
    padding: 20px ;
}
.helpButton {
    display: inline-block;
    margin: 0 0 -3px 6px;
    opacity: 0.4;
}
.helpButton:hover {
    opacity: 0.6;
}
.labelRadio {
    margin-right: 1em;
}
.mediaInput {
    display: inline-block;
}
.result {
    font-size: 20px;
    font-weight: bold;
    margin-left: 1em;
}
#resultFieldset {
    display: none;
}
body {
    font-family: Calibri, Verdana, sans-serif;
}
div>p {
    margin: 0.3em 0;
}
fieldset {
    border: 2px solid #cccccc;
    margin: 0.5em 0;
    padding: 1em;
}
html {
    min-width: 300px;
}                 
input[type="button"] {
    margin: 0.6em 0;
}
input[type="radio"] {
    margin: 6px 6px 6px 0;
}
main {
    margin: auto;
    width: 40%;
}
p {
    line-height: 1.15em;
    margin: 0.6em 0;
}
@media (max-width: 1240px) {
    .formQuestion {
        display: block;
    }
    .mediaInput {
        display: block;
    }
}
@media (max-width: 940px) {
    main {
        margin: auto;
        width: 60%;
    }
}
@media (max-width: 540px){
    main {
        margin: auto;
        width: 100%;        
    }
}