MemoryGame.css

/* General layout */

html, body {
    font: 16px Arial;
    text-align: center;
    margin: 0;
    padding: 0;
    text-align: center;
    width: 100%
}

html {
    height: 100%;
    overflow: hidden
}

body {
    background: #f0f9ff;
    background: -moz-linear-gradient(top,  #f0f9ff 0%, #cbebff 47%, #a1dbff 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#f0f9ff), color-stop(47%,#cbebff), color-stop(100%,#a1dbff));
    background: -webkit-linear-gradient(top,  #f0f9ff 0%,#cbebff 47%,#a1dbff 100%);
    background: -o-linear-gradient(top,  #f0f9ff 0%,#cbebff 47%,#a1dbff 100%);
    background: -ms-linear-gradient(top,  #f0f9ff 0%,#cbebff 47%,#a1dbff 100%);
    background: linear-gradient(to bottom,  #f0f9ff 0%,#cbebff 47%,#a1dbff 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f0f9ff', endColorstr='#a1dbff',GradientType=0 );
}

h1 {
    margin: 1vh 0 0;
    padding: 0;
    width: 100%;
    text-align: center;
    color: #777;
}

p {
    margin: 1vh;
    padding: 0;
    width: 100%;
    text-align: center;
    color: #777;
}

div {
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
}

p strong {
    display: inline-block;
    padding: 5px;
    background-color: red;
    color: #fff;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    line-height: 12px;
    text-align: center;
}

#playfield-wrapper {
    display: inline-block;
    opacity: 1;
    position: relative
}

.win-text {
    color: orange;
    font-size: 100px;
    font-weight: bold;
    height: 100%;
    left: 0;
    margin-top: -50px;
    position: absolute;
    top: 50%;
    width: 100%
}

.lvlButton {
    margin: .5rem;
    line-height: 25px;
    font-weight: bold;
    color: #fff;
    border-radius: 3px;
    background-color: orange;
    border: solid 1px #DC930B;
    border-top: solid 1px #FFC04D;
}

.lvlButton:disabled {
    background-color: #2B54BF;
    border: solid 1px #284EAE;
    border-top: solid 1px #6B88D2;
}

.footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 120px;
    bottom: 0;
    background-color: rgba(120, 120, 120, 0.7);
    text-align: left;
    padding-top: 3px
}

.footer p {
    padding: 0 0 0 20px;
    margin: 5px 0 0;
    line-height: 24px;
    display: block;
    width: auto;
    text-shadow: 1px 1px 0px #333;
}

.footer p,
.footer a {
    text-align: left;
    color: #fff
}

.footer p span {
    display: inline-block;
    width: 100px
}

.footer a {
    display: inline-block;
    background-color: #2B54BF;
    color: #fff;
    font-weight: bold;
    border-radius: 5px;
    padding: 0 5px;
    text-shadow: 1px 1px 0px #000;
    text-decoration: none
}

/* Card layout */

.play-field, .card {
    -moz-user-select: none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    -o-user-select: none;
}

.play-field {
    position: relative;
    margin: 0;
    padding: 0;
    border-collapse: collapse;
    opacity: 1
}

.card {
    position: absolute;
    font-size: 64px;
    cursor: default;
    transition: left 0.5s, top 0.5s;
    -webkit-transition: left 0.5s, top 0.5s;
}

.flipper {
    position: relative;
    border: solid 1px #aaa;
    border-radius: 5px;
    background-color: #ccc;
    text-align: center;
    width: 100%;
    height: 100%;
    box-shadow: 1px 1px 3px 1px #ccc;
    opacity: 1;

}

.face {
    border: solid 1px #aaa;
    border-radius: 3px;
    background-color: #fff;
    position: absolute;
    line-height: 60px;
    box-shadow: inset 0px 0px 4px #aaa;
    margin: 5%;
    height: 90%;
    width: 90%;
}

.front {
    opacity: 0;
    color: #2B54BF;
    text-shadow: 1px 1px 1px rgba(255,255,255,1);
}

.back {
    opacity: 1;
    background-image: repeating-linear-gradient(45deg, rgba(255,255,255,.1), rgba(255,255,255,.1) 5px, rgba(255,0,0,.5) 6px, rgba(255,0,0,.5) 6px, rgba(255,255,255,.1) 7px),repeating-linear-gradient(135deg, rgba(255,255,255,.1), rgba(255,255,255,.1) 5px, rgba(255,0,0,.5) 6px, rgba(255,0,0,.5) 6px, rgba(255,255,255,.1) 7px);
    background-image: -webkit-repeating-linear-gradient(45deg, rgba(255,255,255,.1), rgba(255,255,255,.1) 5px, rgba(255,0,0,.5) 6px, rgba(255,0,0,.5) 6px, rgba(255,255,255,.1) 7px),-webkit-repeating-linear-gradient(135deg, rgba(255,255,255,.1), rgba(255,255,255,.1) 5px, rgba(255,0,0,.5) 6px, rgba(255,0,0,.5) 6px, rgba(255,255,255,.1) 7px);
}

.clicks {
    position: absolute;
    right: 3px;
    bottom: 2px;
    color: #777;
    font: bold 11px Arial
}

/* Card animation */

.flipper {
    transform-style: preserve-3d; /* NOT IE11-friendly -> TODO: http://stackoverflow.com/a/22849231/636849 */
    -webkit-transform-style: preserve-3d;
    transition: transform 0.15s linear;
    -webkit-transition: -webkit-transform 0.15s linear;
}

.face {
    background-size: 100%;
    background-position: center;
    background-repeat: no-repeat;
    transition: opacity 0.15s linear;
    -webkit-transition: opacity 0.15s linear;
}

.flipfront {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    box-shadow: -1px 1px 3px 1px #ccc;
}

.flipback {
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
}

.front {
    transform: rotateY(-180deg);
    -webkit-transform: rotateY(-180deg);
}

@-moz-keyframes pulse {
    from {
        background-color: #fff;
    }
    to {
        background-color: orange;
    }
}

@-webkit-keyframes pulse {
    from {
        background-color: #fff;
    }
    to {
        background-color: orange;
    }
}

@keyframes pulse {
    from {
        background-color: #fff;
    }
    to {
        background-color: orange;
    }
}

.pulse {
    -moz-animation: pulse 0.2s ease-in-out 5 alternate;
    -webkit-animation: pulse 0.2s ease-in-out 5 alternate;
    animation: pulse 0.2s ease-in-out 5 alternate;
}

.play-field.win td .flipper {
    -webkit-transition: opacity 0.5s ease 1.5s;
    transition: opacity 0.5s ease 1.5s;
    opacity: 1 !important
}

.win-text {
    opacity: 0;
    z-index: 1;
    margin-top: 0;
    text-shadow: -1px -1px #C18005, 1px -1px #C18005, -1px 1px #C18005, 1px 1px #C18005;
    -webkit-transition: all 1.5s ease 0.5s;
    transition: all 1.5s ease 0.5s;
}

#playfield-wrapper.win .win-text {
    font-size: 100px;
    opacity: 1;
}

footer {
    position: absolute;
    right: 0;
    bottom: 0;
    padding: 1rem;
}