style.css

html,
body {
  padding: 0;
  margin: 0;
  overflow: hidden;
  text-align: center;
  font-family: 'Adobe 宋体 Stdl', '华文中宋', '华文宋体', '宋体', serif;
  color: #333;
  font-weight: 100;
  position: fixed;
  width: 100%;
  height: 100%;
}
input,
button,
textarea {
  font: inherit;
  color: inherit;
}
#intro,
#full,
#divide {
  position: absolute;
  width: 100%;
  height: 100%;
}
#full,
#divide {
  display: none;
  overflow: auto;
}
#intro {
  background-color: #333;
  transition: top ease-in 0.35s;
  top: 0;
  color: white;
  overflow: hidden;
  padding-bottom: 50px;
}
#intro.chosen { 
  top: -100%;
}
#choose {
  font-size: 24px;
  margin-top: 100px;
  transition: all 0.35s;
}
@media all and (max-width:480px) {
  #choose {
    font-size: 16px;
    margin-top: 20px;
  }
}
#choice {
  margin-top: 50px;
}
#choice > div {
  display: inline-block;
  width: 100px;
  height: 100px;
  padding: 50px;
  line-height: 100px;
  font-size: 24px;
}
#return-intro {
  width: 100%;
  height: 50px;
  line-height: 50px;
  font-size: 20px;
  position: absolute;
  bottom: 0;
  background-color: #333;
}

.canvas-container,
.form-group {
  width: 560px;
  max-width: 100%;
  box-sizing: border-box;
  padding: 0 10px;
  margin: 0 auto 10px;
  position: relative;
  overflow: hidden;
}
.canvas-container {
  margin-top: 60px;
}
canvas {
  max-width: 100%;
}
.form-group input {
  width: 100%;
  margin: 0;
}
.form-group label {
  position: absolute;
  top: 0;
  left: 10px;
}
.form-group label + input {
  width: 80%;
  margin: 0;
  float: right;
}
.save {
  height: 50px;
  background-color: #333;
  color: white;
  line-height: 50px;
}

.left {
  position: relative;
  width: 48%;
  float: left;
  padding: 0 10px;
  margin: 0 -10px;
}
.right {
  position: relative;
  width: 48%;
  float: right;
  padding: 0 10px;
  margin: 0 -10px;
}


.myth {
  position: relative;
}
.myth div::before,
.myth div::after {
	position: absolute;
	top: 5px;
	right: 5px;
	bottom: 5px;
	left: 5px;
	content: '';
	opacity: 0;
	-webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
	transition: opacity 0.35s, transform 0.35s;
}
.myth div::before {
	border-top: 1px solid #e0e0e0;
	border-bottom: 1px solid #e0e0e0;
	-webkit-transform: scale(0,1);
	transform: scale(0,1);
}
.myth div::after {
	border-right: 1px solid #e0e0e0;
	border-left: 1px solid #e0e0e0;
	-webkit-transform: scale(1,0);
	transform: scale(1,0);
}
.myth:hover div::before,
.myth:hover div::after {
	opacity: 1;
	-webkit-transform: scale(1);
	transform: scale(1);
}