capitals_quiz/game_styles.css

:root {
	--a-color: var(--red);
	--b-color: var(--yellow);
	--c-color: var(--green);
	--d-color: var(--blue);
	--question-country-color: var(--teal);
	--question-capital-color: var(--blue);
}

input {
	font-family: inherit
}

.correct {
	animation: correct .5s;
}

.incorrect {
	animation: incorrect .5s;
}

@keyframes correct {
	0%   { background: var(--default-bg); }
	50%  { background: var(--green); }
	100% { background: var(--default-bg); }
}

@keyframes incorrect {
	0%   { background: var(--default-bg); }
	50%  { background: var(--red); }
	100% { background: var(--default-bg); }
}

#toprow {
	display: flex;
	justify-content: space-between;
	align-items: center;
}

@media only screen and (max-width: 600px) {
	#toprow {
		flex-direction: column-reverse;
	}
}

#question {
	font-size: 1.5em;
	display: flex;
	align-items: center;
}

#question img {
	max-height: 10vh;
}

#question * {
	margin: 1em;
}

#score {
	--good: var(--green);
	--okay: var(--yellow);
	--bad: var(--red);
	background: var(--good);
}

#time {
    background: var(--blue);
}

#gameinfo {
    display: flex;
}

#gameinfo * {
    margin: 0 0.5em 0 0.5em;
}

#previousQuestionAnswer { background: var(--green) }

#game .answer {
	display: flex;
	justify-content: space-evenly;
	align-items: center;
	align-content: center;
}

#game .answer .text {
	width: 50%;
}

#game .answer .letter {
	font-size: 1.5em;
	padding: 1em;
	border: 0;
	border-radius: 0.25em;
}

#a {
	background-color: var(--a-color);
	border-color: var(--a-color);
}

#b {
	background-color: var(--b-color);
	border-color: var(--b-color);
}

#c {
	background-color: var(--c-color);
	border-color: var(--c-color);
}

#d {
	background-color: var(--d-color);
	border-color: var(--d-color);
}

span#questionCountry {
	background-color: var(--question-country-color);
}

span#questionCapital {
	background-color: var(--question-capital-color);
}

#settings {
	width: 100% 
}

#regionList {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
}

#settings .regionListItem {
	padding: 1em;
	transition: 0.5s;
}

#settings .regionListItem:hover {
	background: #d9d9d9;
	color: black;
}

/* toggle switches */
/* https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_switch */
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--question-country-color);
  -webkit-transition: .4s;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--question-capital-color);
}

input:focus + .slider {
  box-shadow: 0 0 1px var(--blue);
}

input:checked + .slider:before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}

/* Rounded sliders */
.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

#questionTypeSelector {
	display: flex;
	width: 100%;
	align-items: center;
	justify-content: space-around;
	margin-top: 3em;;
	margin-bottom: 3em;;
}

.text img, td img { max-height: 15vh }

#questionTypeSelector input[type="radio"] { display: none; }
input[type="radio"]+label {
	padding: 0.5em;
}
input[type="radio"]:checked+label {
	background-color: var(--yellow);
}

#previousQuestionAnswer {
	display: inline;
}

#previousQuestionAnswer img {
	display: inline; 
	max-height: 2em;
}