css/hotkeys.css

.cfp-hotkeys-container {
  display: table !important;
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  color: #333;
  font-size: 1em;
  background-color: rgba(255,255,255,0.9);
}

.cfp-hotkeys-container.fade {
  z-index: -1024;
  visibility: hidden;
  opacity: 0;
  -webkit-transition: opacity 0.15s linear;
  -moz-transition: opacity 0.15s linear;
  -o-transition: opacity 0.15s linear;
  transition: opacity 0.15s linear;
}

.cfp-hotkeys-container.fade.in {
  z-index: 10002;
  visibility: visible;
  opacity: 1;
}

.cfp-hotkeys-title {
  font-weight: bold;
  text-align: center;
  font-size: 1.2em;
}

.cfp-hotkeys {
  width: 100%;
  height: 100%;
  display: table-cell;
  vertical-align: middle;
}

.cfp-hotkeys table {
  margin: auto;
  color: #333;
}

.cfp-content {
  display: table-cell;
  vertical-align: middle;
}

.cfp-hotkeys-keys {
  padding: 5px;
  text-align: right;
}

.cfp-hotkeys-key {
  display: inline-block;
  color: #fff;
  background-color: #333;
  border: 1px solid #333;
  border-radius: 5px;
  text-align: center;
  margin-right: 5px;
  box-shadow: inset 0 1px 0 #666, 0 1px 0 #bbb;
  padding: 5px 9px;
  font-size: 1em;
}

.cfp-hotkeys-text {
  padding-left: 10px;
  font-size: 1em;
}

.cfp-hotkeys-close {
  position: fixed;
  top: 20px;
  right: 20px;
  font-size: 2em;
  font-weight: bold;
  padding: 5px 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
  min-height: 45px;
  min-width: 45px;
  text-align: center;
}

.cfp-hotkeys-close:hover {
  background-color: #fff;
  cursor: pointer;
}

@media all and (max-width: 500px) {
  .cfp-hotkeys {
    font-size: 0.8em;
  }
}

@media all and (min-width: 750px) {
  .cfp-hotkeys {
    font-size: 1.2em;
  }
}