html {
  overflow: hidden;
}

body {
  margin: 0;
  border: 0;
  overflow: hidden;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -ms-high-contrast-adjust: none;
  user-select: none;
}

h4 {
  font-size: 16px;
}

.center {
  text-align: center;
}

.close-button {
  position: absolute;
  top: 3px;
  right: 3px;
  width: 40px;
  height: 40px;
  background: url('../images/close_inactive.png') no-repeat center center transparent;
  background-size: 40px 40px;
}

.close-button:hover {
  background: url('../images/close_hover.png') no-repeat center center transparent;
}

.close-button:active {
  background: url('../images/close_active.png') no-repeat center center transparent;
  background-size: 38px 38px;
}
