body {
	background-color: lightsteelblue;
	color: midnightblue;
  font-family: Muli, Arial, Helvetica, sans-serif;
  font-size: 14px;
  
  /*animation-name: example;
  animation-duration: 4s;*/
}

.error {
  color:tomato;
}
.bad_answer {
  text-decoration: line-through;
  color: crimson;
  cursor: not-allowed;
}
.correction {
  color: crimson;
}
.good_answer {
  color: seagreen;
}
span {
  display: block;
}
a {
  color: darkslateblue;
  padding: 10px;
}
.menu {
  background-color: cornflowerblue; 
  list-style-type: none;
  text-align: right;
  margin: 0;
  padding: 0;
  width: 100%;
  position: sticky;
  top: 0;
  left: 0;
}
.menu li {
  display: inline-block;
  font-size: 16px;
  padding: 5px;
}
.menu li:first-child {
  float: left;
}
.menu li a:hover:not(.active) {
  background-color: lightblue;
}
.active {
  background-color: lightcyan;
  text-decoration: none;
}
label {
  display: inline-block;
  padding: 12px 10px 10px 10px;
}
input, button, select, textarea {
  color: darkslateblue;
  background-color: lightcyan;
  border-color: grey;
  border-style: solid;
  font-size: 14px;
  padding: 4px;
}
.button_link {
  font-size: 16px;
  padding: 10px;
  border: none;
  background-color: cornflowerblue;
  text-decoration: underline;
}
.button_link:hover {
  background-color: lightblue;
}
.button:hover {
  background-color: lightblue;
}
.link {
  vertical-align: middle;
  color: darkslateblue;
}
.btn {
  border: none;
  background-color: #a4c0f4;
  font-family: inherit;
  padding-right: 10px;
  padding-left: 10px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  display: inline-block;
  transition-duration: 0.4s;
  box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
}

.hidden {
  visibility: hidden;
}
.undisplayed {
  display:none;
}
.btn:hover {background: lightblue;}
.container {
  /*border-radius: 5px;*/
  clear: both;
  display: block;
  background-color: lightskyblue;
  padding: 6px;
  border: 2px solid midnightblue;
  border-radius: 5px;
  width: 40%;
}
.c_wide {
  width:70%;
}
.col {
  display: inline-block;
  /*margin: 6px;*/
}
.row {
  display: block;
  margin: 6px;
}
.disabled {
  opacity: 0.7;
  cursor: not-allowed;
}
.rainbow {
  /*width: 100%;
  height: 500px;*/
  background-color: lightsteelblue;
  animation-name: example;
  animation-duration: 4s;
}

@keyframes example {
  0% {background-color: lightsteelblue;}
  15% {background-color: #ffcce6;}
  30% {background-color: #ffcc99;}
  45% {background-color: #ffffcc;}
  60% {background-color: #ccffcc;}
  80% {background-color: #b3e6ff;}
  100% {background-color: lightsteelblue;}
}
.footer {
	position:fixed;
	left:0px;
	bottom:0px;
	height:20px;
	width:100%;
	background-color: cornflowerblue;
  text-align: center;
  vertical-align: middle;
  font-size: 14px;
  color: white;
}

.langmenu {
  background-color: lightsteelblue; 
  list-style-type: none;
  /*text-align: center;*/
  margin: 0;
  padding: 0;
  /*width: auto;*/
  color: white;
  float: right;
  position:fixed;
	left:0px;
	top:8px;
}
.langmenu li {
  display: block;
  margin: 0;
  padding: 0;
  /*font-size: 18px;
  padding: 5px 0px 5px 0px;*/
  /*width: 100%;*/
}
.lang_img {
  opacity: 0.5;
  width: 20px;
  /*height: 10px;*/
}
.lang_img_active {
  opacity: 1;
  width: 20px;
  /*height: 10px;*/
}
.langmenu li a:hover:not(.lang_img_active) {
  opacity: 0.8;
  transition-duration: 0.4s;
}
/*a {
  color: white;
  padding: 5px;
  text-decoration: none;
}*/
.lang {
  padding: 0;
}
.lang_link {
  color: white;
}