* {
	margin: 0;
	padding: 0;/* 清除内外边距 */
	text-decoration: none;
	list-style: none;
	box-sizing: border-box;
}

body {
	font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji";
    font-size: 15px;
    line-height: 1.5;
    color: #24292e;
    background-color: #fff;
}

ul {
	list-style: none;/* 去掉列表样式小点 */
}

.clearfix:before, .clearfix:after {/* 清除浮动 */
	display: table;
	content: "";
}
.clearfix:after {
	clear: both;
}
.clearfix {
	*zoom: 1;
}

a {
	color: blue;
	text-decoration: none; /* 取消下划线 */
}
a:hover {
	background: none;
}
input {
	border: 0; /* 所有的表单边框为0 */
	box-sizing: border-box;/* border和padding 都包含在width里面*/
}

.hljs {
    background: 0;
}
pre {
    padding: 0;
    height: auto;
    margin-top: 0;
    margin-bottom: 0;
    background-color: #f0f0f0;
}
pre code {
    overflow-x: auto;
    overflow-y: auto;
    word-break: keep-all;
    white-space: pre;
}