.item input,
		.item button {
			background: transparent;
			border: 0;
			outline: none;
		}
	.loginbox {
			width: 400px;
			height: 364px;
			background-color: #0c1622;
			margin: 100px auto;
			border-radius: 10px;
			box-shadow: 0 15px 25px 0 rgba(0, 0, 0, .6);
			padding: 40px;
			box-sizing: border-box;
		}

		h2 {
			text-align: center;
			color: aliceblue;
			margin-bottom: 30px;
			font-family: 'Courier New', Courier, monospace;
		}

		.item {
			height: 45px;
			border-bottom: 1px solid #fff;
			margin-bottom: 40px;
			position: relative;
		}

		.item input {
			width: 100%;
			height: 100%;
			color: #fff;
			padding-top: 20px;
			box-sizing: border-box;
		}
        .item label{
			font-size: 16px;
			color: #03e9f4;
		}
		.item input:focus+label,
		.item input:valid+label {
			top: 0px;
			font-size: 2px;
		}

		.item label {
			position: absolute;
			left: 0;
			top: 12px;
			transition: all 0.5s linear;
		}

		.btn {
			padding: 10px 20px;
			margin-top: 0px;
			color: #03e9f4;
			position: relative;
			overflow: hidden;
			text-transform: uppercase;
			letter-spacing: 2px;
			left: 35%;
		}

		.btn:hover {
			border-radius: 5px;
			color: #fff;
			background: #03e9f4;
			box-shadow: 0 0 5px 0 #03e9f4,
				0 0 25px 0 #03e9f4,
				0 0 50px 0 #03e9f4,
				0 0 100px 0 #03e9f4;
			transition: all 1s linear;
		}

		.btn>span {
			position: absolute;
		}

		.btn>span:nth-child(1) {
			width: 100%;
			height: 2px;
			background: -webkit-linear-gradient(left, transparent, #03e9f4);
			left: -100%;
			top: 0px;
			animation: line1 1s linear infinite;
		}

		@keyframes line1 {

			50%,
			100% {
				left: 100%;
			}
		}

		.btn>span:nth-child(2) {
			width: 2px;
			height: 100%;
			background: -webkit-linear-gradient(top, transparent, #03e9f4);
			right: 0px;
			top: -100%;
			animation: line2 1s 0.25s linear infinite;
		}

		@keyframes line2 {

			50%,
			100% {
				top: 100%;
			}
		}

		.btn>span:nth-child(3) {
			width: 100%;
			height: 2px;
			background: -webkit-linear-gradient(left, #03e9f4, transparent);
			left: 100%;
			bottom: 0px;
			animation: line3 1s 0.75s linear infinite;
		}

		@keyframes line3 {

			50%,
			100% {
				left: -100%;
			}
		}

		.btn>span:nth-child(4) {
			width: 2px;
			height: 100%;
			background: -webkit-linear-gradient(top, transparent, #03e9f4);
			left: 0px;
			top: 100%;
			animation: line4 1s 1s linear infinite;
		}

		@keyframes line4 {

			50%,
			100% {
				top: -100%;
			}
		}
		
		
		@keyframes blink{
  0%{opacity: 1;}
     
  100%{opacity: 0;} 
}
/* 添加兼容性前缀 */
@-webkit-keyframes blink {
    0% { opacity: 1; }
    100% { opacity: 0; }
}
@-moz-keyframes blink {
    0% { opacity: 1; }
    100% { opacity: 0; }
}
@-ms-keyframes blink {
    0% {opacity: 1; } 
    100% { opacity: 0;}
}
@-o-keyframes blink {
    0% { opacity: 1; }
    100% { opacity: 0; }
}
/* 定义blink类*/
.blink{
	
    animation: blink 1s linear infinite;  
    /* 其它浏览器兼容性前缀 */
    -webkit-animation: blink 1s linear infinite;
    -moz-animation: blink 1s linear infinite;
    -ms-animation: blink 1s linear infinite;
    -o-animation: blink 1s linear infinite;
}