.group {display: none}
.group:nth-child(1){display:block;}

.calculation{display:none;}
.group:nth-child(1) .calculation:nth-child(1) {display: block}
			
.fa-smile{font-size:7vw;color:#CED;color:#ACB}

.completed {color: #393;}
.correct{background:green;color:white;}
.error{background:red;color:white;}

i.small{font-size:0.7em;}
i.large{font-size:3em;}

i.fa-check{color:green}
i.fa-times{color:red}

@media only screen and (min-width: 750px) {
	.fa-smile{font-size:2em;}
}