*, *:before, *:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
.cf:after {
  content:"";
  display:table;
  clear:both;
}
body {
  color: #16a085;
  background: #ecf0f1;
  font-family: 'Open Sans', sans-serif;
}
h1 {
  margin: 0;
  text-align: center;
}
input[type=file] {
  display: none;
}
.btn {
  width: 96px;
  height: 48px;
  line-height: 48px;
  color: #fff;
  background: #16a085;
  text-align: center;
  text-decoration: none;
  border: none;
  outline: none;
}
.btn--square {
  width: 48px;
}
.btn:disabled {
  opacity: 0.5;
}
/* Estructura */
.header,
.controls {
  padding: 10px;
  border-bottom: 1px solid #16a085;
}

/* Responsive Canvas */
.canvas-wrapper {
  margin: auto;
  padding: 10px;
  max-width: 960px;
}
.canvas-responsive {
  position: relative;
  padding-bottom: 56.25%;
  background: #fff;
}
.canvas-container,
.canvas {
  position: absolute;
  width: 100% !important;
  height: auto !important;
}