.drawingboard {
  width: 100%;
  margin-bottom: 1.5rem;
}
.drawingboard * {
  box-sizing: border-box;
}
.drawingboard-toolbar {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
}
.drawingboard-toolbar__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border: 0;
  border-radius: 0;
  color: #fff;
  background: #333;
  padding: 0;
  margin: 0;
  font-size: 10px;
  line-height: 1;
  height: 50px;
  width: 60px;
}
.drawingboard-toolbar__btn:first-of-type {
  border-top-left-radius: 4px;
}
.drawingboard-toolbar__btn:last-of-type {
  border-top-right-radius: 4px;
}
.drawingboard-toolbar__btn:hover {
  cursor: pointer;
}
.drawingboard-toolbar__btn:hover, .drawingboard-toolbar__btn.active {
  background: #0abde3;
}
.drawingboard-toolbar__btn:disabled {
  cursor: default;
  color: #888;
  background: #333;
}
.drawingboard-toolbar__btn i {
  font-size: 18px;
  padding-bottom: 6px;
}
/* Font Awesome 4, 5 の併用環境対策 */
.drawingboard-toolbar__btn .fa-reply:before {
  content: "\f3e5";
}
.drawingboard-canvas__wrapper {
  position: relative;
  border: 2px solid #ccc;
  width: 100%;
}
.drawingboard-canvas__placeholder {
  position: absolute;
  top: 0;
  left: 0;
  padding: 20px;
  width: 100%;
  pointer-events: none;
  z-index: 1;
  font-size: 14px;
  color: #757575;
}
.drawingboard-canvas__placeholder.hidden {
  display: none;
}