* {
	box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
	font-family: Arial, Helvetica Neue, Helvetica, sans-serif;
	font-size: 62.5%; /* Fallback */
}

@media (min-height: 400px) and (min-width: 400px) and (orientation : landscape) {
	html, body {font-size: 2.5vh;}
}

@media (min-height: 400px) and (min-width: 400px) and (orientation : portrait) {
	html, body {font-size: 2.5vw;}
}

div, button{
	text-align: center;
	font-size: 1.6rem;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-around;
	height: 33%;
}

button {
	position: relative;
	background: transparent;
	border: 0;
	cursor: pointer;
	width: 8rem;
	height: 5rem;
}
button:before {
	content:'';
	position: absolute;
	top: 0;
	left: 50%;
	transform: translateX(-50%);
	height: 100%;
	background: url('../favicon.png') no-repeat;
}
.rock:before {
	background-size: auto 240%;
	background-position: 100% 20%;
	width: 60%;
}

.paper:before {
	background-size: auto 205%;
	background-position: 37% 103%;
	width: 72%;
}

.scissors:before {
	background-size: auto 240%;
	background-position: 0% -4%;
	width: 80%;
}

.tip {
	position: fixed;
	top: 0;
	right: 0;
	padding: 1.2rem;
	background: #a5d6a7;
	border: 2px solid #43a047;
	border-radius: 1.5rem;
	margin: 1rem;
	font-size: 1.2rem;
	width: 80%;
	height: auto;
	transition: all .3s ease;
	white-space: pre;
	overflow: hidden;
	cursor: pointer;
}
.tip:after {
	content: 'x';
	position: absolute;
	top: .6rem;
	right: .9rem;
	color: #333;
}
.hidden{
	background: #ccc;
	border-color: #999;
	color: transparent;
	width: 2.4rem;
	height: 2.4rem;
}
.hidden:after{
	content: '?';
}