*{
    background-color: #ddbc01;
    margin: 0;
    padding: 0;
    box-sizing:border-box;
    font-family: "Pixelify Sans", sans-serif;
  
}

h1 {
    font-size: 60px;
}
body{
    margin: 50px;
}
.wrapper{
    width: 100%;
    min-height: 500px; 
    text-align: center;
    position: relative;
}

.middle{
    display: block;
    margin: 0 auto;
}
.options{
    text-align:center;
    width: 100%;
    height: 100%;
    font-size: 22px;
    z-index: 2;
    position: absolute;
    top:20px;
}
.matrix{
    overflow:hidden;
    background: #656D78;
    padding: 8px;
    position: relative;
}
.slide{
    background:transparent;
    position: relative;
    opacity: 0;
    margin-bottom: 60px;
    overflow: hidden;
    
}
.show{
    opacity: 1;
    z-index: 3;
}
.start p{
    color: white;
    padding: 10px;
    font-weight: bold;
    margin: 43% auto 0;
    cursor: pointer;
    font-size: 30px;
    display: table;
}
.end{
    display: none;
}
.popup{
    position: absolute;
    width:100%;
    height: 100%;
    top:0;
    right:0;
    background: black;
    opacity: 0.7;
    text-align: center;
    z-index: 2;
    
}
.tile{
    width:80px;
    height:80px;
    float: right;
    cursor: pointer;
    background:inherit;
    margin: 5px;
    perspective: 1000px;
    
}
.end-content{
   margin-top: 42%; 
}
.end-msg{
    color:white;
    display: none;
    font-size: 30px;
    font-weight: bold;
}
.button{
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    color: white;
    font-size:30px;
}
.button:hover{
    transform: scale(1.2);
}
.matrix-info{
    padding:10px 5px;
    overflow: hidden;
}
.score{
    float:left;
}
.tiles{
    float:right;
}
.tile.hover .flipper {
		transform: rotateY(180deg);
	}

.front, .back {
	width: 100%;
	height: 100%;
}
.flipper {
    width: 100%;
    height: 100%;
	transition: 0.6s;
	transform-style: preserve-3d;

	position: relative;
}
.front, .back {
	backface-visibility: hidden;

	position: absolute;
	top: 0;
	left: 0;
}
.front {
	z-index: 2;
	/* for firefox 31 */
	transform: rotateY(0deg);
    background: #CCD1D9;
}
.back {
	transform: rotateY(180deg);
    background: #FC6E51;
}
.front:hover{
    background: #E6E9ED;
}
.btn{

    font-size: 22px;
    background-color:#000;
    color: #fff;
    border: 0px;
    border-radius: 3px;
    padding: 10px 20px;
    cursor: pointer;
    margin-top: 15px;
}
.title{
    font-size:30px;
    font-weight: normal;
    color: #333;
    padding: 20px;
}
.radio-container {
    position: relative;
    padding-left: 35px;
    cursor: pointer;
    font-size: 22px;
    margin:0 10px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
  }
  .radio-container input {
    position: absolute;
    opacity: 0;
  }
  .checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 25px;
    width: 25px;
    background-color: #ddd;
    border-radius: 50%;
  }
  .radio-container:hover input ~ .checkmark {
    background-color: #ccc;
  }
  .radio-container input:checked ~ .checkmark {
    background-color: #656D78;
  }
  .checkmark:after {
    content: "";
    position: absolute;
    display: none;
    top: 9px;
    left: 9px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: white;
  }
  .radio-container input:checked ~ .checkmark:after {
    display: block;
  }
  .h-float-left {
    float: none;
    margin: 0px;
}
  .github-link{
    font-size: 30px;
    color: #333;
    display: block;
    position: absolute;
    top: 10px;
    left: 10px;
  }