body,
div,
h1,
h2,
form,
fieldset,
input,
textarea,
footer,
p {
    margin: 0;
    padding: 0;
    border: 0;
    outline: none;
}

body {

    -webkit-perspective: 800px;
    background: rgba(122, 129, 135, 1);
    background-image: linear-gradient(135deg,
            rgba(157, 191, 158, 0.9) 0%,
            rgba(81, 152, 114, 0.9) 20%,
            rgba(61, 90, 128, 0.9) 50%,
            rgba(85, 53, 85, 0.9) 100%);
    -webkit-animation: bugfix infinite 1s;
}

@-webkit-keyframes bugfix {
    from {
        padding: 0;
    }

    to {
        padding: 0;
    }
}

p {
    font-family: 'Open Sans', sans-serif;
    font-size: 20px;
    font-weight: 100;
    opacity: 0;
}

#wrap {
    width: 530px;
    height: 1000px;
    margin: 20px auto 0;
}

h1 {
    font-family: 'Open Sans', sans-serif;
    font-size: 48px;
    font-weight: 400;
    color: #ADD3AE;
    margin: 50px 0;
    text-align: center;
}

#letter_wrap {
    overlay: hidden;
    height: 446px;
    position: relative;
    top: 0px;
    -webkit-transition: all 1s ease-in-out;
    -moz-transition: all 1s ease-in-out;
    -o-transition: all 1s ease-in-out;
    transition: all 1s ease-in-out;
}

#back {
    position: absolute;
    bottom: 128px;
    left: 0px;
    background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/144467/before1.png');
    width: 530px;
    height: 132px;
}

#flap {
    position: absolute;
    bottom: 65px;
    left: 0px;
    width: 530px;
    height: 390px;
    -webkit-transform-style: preserve-3d;
    z-index: 5;
    -webkit-transition: all 1.5s 1s linear;
}

#flap>div {
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
}

#open_flap {
    top: 195px;
    background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/144467/flap.png') no-repeat;
    -webkit-transform: rotateY(-180deg);
}

#closed_flap {
    top: 0%;
    background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/144467/flap_closed.png') no-repeat 0 195px;
}


#front {
    position: absolute;
    bottom: 0px;
    left: 0px;
    background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/144467/after.png');
    width: 530px;
    height: 260px;
}

.checkbox {
    position: absolute;
    opacity: 0;
    top: 0;
    left: 0;
    width: 70%;
    height: 70%;
    z-index: 100;
}

#checkbox:checked+#letter_wrap {
    height: 776px;
    top: -200px;
    -webkit-transition: all 1s ease-in-out 2s;
    -moz-transition: all 1s ease-in-out 2s;
    -o-transition: all 1s ease-in-out 2s;
    transition: all 1s ease-in-out 2s;
}

#letter {
    -webkit-transition: all 1s ease-in-out;
    -moz-transition: all 1s ease-in-out;
    -o-transition: all 1s ease-in-out;
    transition: all 1s ease-in-out;
    background: #ffc url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/144467/letter_bg.png');
    position: relative;
    top: 200px;
    overlay: hidden;
    height: 190px;
    width: 400px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #fff;
    border-radius: 3px;
    -webkit-box-shadow: 0px 0px 3px #9d9d9d, inset 0px 0px 27px #fff;
    -moz-box-shadow: 0px 0px 3px #9d9d9d, inset 0px 0px 14px #fff;
    box-shadow: 0px 0px 3px #9d9d9d, inset 0px 0px 27px #fff;
}

#checkbox:checked+#letter_wrap>#flap {
    -webkit-transition: all 2s linear;
    transform: rotateX(180deg);
    -webkit-transform: rotateX(180deg);
    z-index: -1;
}

#checkbox:checked+#letter_wrap>#letter {
    height: 520px;
    -webkit-transition: all 1s ease-in-out 2s;
    -moz-transition: all 1s ease-in-out 2s;
    -o-transition: all 1s ease-in-out 2s;
    transition: all 1s ease-in-out 2s;
}


#checkbox:checked+#letter_wrap>#letter>p {
    opacity: 1;
    -webkit-transition: opacity 1s ease-in-out 2s;
    -moz-transition: opacity 1s ease-in-out 2s;
    -o-transition: opacity 1s ease-in-out 2s;
    transition: opacity 1s ease-in-out 2s;
}