quiz.css

html,
body {
	height: 100%;
	font-size: 16px
}

body {
	display: flex;
	flex-direction: column;
	font-family: 'Lato', sans-serif;
	margin: 0;

}

.content {
	flex: 1 0 auto;
	min-height: 500px;
	position: relative;
}

main {
	padding: 30px;
	min-height: 100px;
	font-size: 1.8em;
	text-align: center;
}

header h1 {
	width: 90%;
	margin: 20px auto;
	background-color: #2cbe4e;
	color: white;
	font-size: 4em;
	padding: 0.2em;
	border-radius: 50px;
	text-align: center;
	text-transform: uppercase;
}

radiogroup {
	display: flex;
	justify-content: center;
	flex-wrap: wrap;
}

label {
	display: flex;
	align-items: center;
	width: auto;
  position: relative;
  padding: 4px 4px 4px 1.5em;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  margin-right: 1.5em;
}

label:last-child {
  margin-right: 0;
}

input {
  position: absolute;
	left: 0;
	top: 0;
  opacity: 0;
  cursor: pointer;
}

.checkmark {
  position: absolute;
  left: 0;
  height: 25px;
  width: 25px;
	border: 2px solid #000;
  border-radius: 50%;
}

label:hover {
	background: rgba(176, 251,185, 0.2);
}

input:checked ~ .checkmark {
	border: 2px solid #2cbe4e;
}

input:checked ~ .label-text {
	color: #2cbe4e;
}

.checkmark:after {
  content: "";
  position: absolute;
	top: 9px;
  left: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2cbe4e;
  display: none;
}

input:checked ~ .checkmark:after {
  display: block;
}

button.btn {
	background-color: #2cbe4e;
	border: none;
	color: #fff;
	cursor: pointer;
	display: block;
	font-size: 20px;
	margin: 40px auto;
	max-width: 150px;
	border-radius: 10px;
	outline: none;
	padding: 10px 5px;
	text-transform: uppercase;
	width: 100%;
}

#next-btn {
	max-width: 300px;
}

button.btn:hover {
	background-color: grey;
}

.answer {
	display: none;
}

.btn-text:hover .answer {
	display: block;
}

#last-btn,
#result-btn {
	display: none;
	max-width: 300px;
}

.timer-container {
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	font-size: 1.8em;
	bottom: 0;
}

footer {
	color: black;
	margin: 0 auto;
	border-top: 2px solid #2cbe4e;
	flex-shrink: 0;
	text-align: center;
  width: 100%;
}
/* INFORMATION PANEL*/

.progress {
	position: relative;
	display: flex;
}
.progress .progress-track {
	position: absolute;
	top: 10px;
	width: 100%;
	height: 5px;
	background-color: rgba(176, 251,185, 0.4);
	z-index: -1;
}
.progress .progress-step {
	position: relative;
	width: 100%;
	font-size: 12px;
	text-align: center;
}
.progress .progress-step:last-child:after {
	display: none;
}
.progress .progress-step:before {
	content: url("check-mark-10-16.png");
	display: flex;
	margin: 0 auto;
	width: 16px;
	height: 16px;
	background: rgba(176, 251,185, 0.4);
	border: 4px solid rgba(176, 251,185, 0.4);
	border-radius: 100%;
	color: #fff;
}
.progress .progress-step:after {
	content: url("check-mark-10-16.png");
	position: absolute;
	left: 50%;
	width: 0%;
	transition: width 1s ease-in;
	height: 5px;
	background: #6bd59e;
	z-index: -1;
	margin-top: -13px;
}
.progress .progress-step.is-active {
	color: #b0fee1;
}
.progress .progress-step.is-active:before {
	border: 4px solid #8fee9f;
	background-color: #8fee9f;
	animation: pulse 2s infinite;
}
.progress .progress-step.is-complete {
	color: #0bea8c;
}
.progress .progress-step.is-complete:before {
	font-size: 10px;
	color: #2cbe4e;
	background: #2cbe4e;
	border: 4px solid transparent;
}
.progress .progress-step.is-complete:after {
	animation: nextStep 1s;
	animation-fill-mode: forwards;
}

@keyframes pulse {
	0% {
		box-shadow: 0 0 0 0 rgba(176, 251,185, 0.4);
	}
	70% {
		box-shadow: 0 0 0 10px rgba(176, 251,185, 0.2);
	}
	100% {
		box-shadow: 0 0 0 0 rgba(176, 251,185, 0);
	}
}
@media screen and (max-width: 480px) {
	header h1 {
		width: 80%;
	}
	radiogroup {
		flex-direction: column;
	}
}
@media screen and (max-width: 780px) {
	body {
		font-size: 10px;
	}
  .progress {
    display: none;
  }
	.checkmark {
		height: 16px;
  	width: 16px;
	}
	.checkmark:after {
		top: 4px;
		left: 4px;
	}
	footer {
		font-size: 1.3em;
	}
}