* {
	margin: 0;
	padding: 0;
	-webkit-user-select: none; /* Safari */
	-moz-user-select: none; /* Firefox */
	-ms-user-select: none; /* IE/Edge */
	user-select: none; /* 标准语法 */
}

img {
	pointer-events: none;
}

@keyframes backgroundAnimation {
  0% {
    opacity: 1;
    /*color: #0000ff;*/
  }
  50%{
  	opacity: 0.85;
  	/*color: #ff0000;*/
  }
  100% {
    opacity: 1;
    /*color: #0000ff;*/
  }
}

canvas#canvas {
	display: block;
	background-image: url(../img/login-fog.jpg);
	background-size: cover;
	background-position: center;
	background-repeat: no-repeat;
	animation: backgroundAnimation 5s linear infinite; /* 应用动画 */
}