方法一：css reset
/* reset */html{color:#000;background:#fff;}body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,input,button,textarea,p,blockquote,th,td{margin:0;padding:0;}body{font:12px/1 Tahoma,Helvetica,Arial,"\5b8b\4f53",sans-serif;}img{border:none;}em,strong{font-style:normal;font-weight:normal;}li{list-style:none;}table {border-collapse:collapse;border-spacing:0;}h1{font-size:18px;}h2{font-size:16px;}h3{font-size:14px;}h4, h5, h6{font-size:100%;}q:before,q:after{content:'';}/* 消除q前后的内容 */button,input,select,textarea{font-size:100%;}/* 使得表单元素在 ie 下能继承字体大小 */input,button,textarea,select,optgroup,option{font-family:inherit;font-size:inherit;font-style:inherit;font-weight:inherit;}address,cite,dfn,em,var{font-style:normal;} /* 将斜体扶正 *//* link */a{color:#36c;text-decoration:none;}a:hover{color:#f60;text-decoration:underline;} 方法二：normalize.css
/*! normalize.css v4.1.1 | MIT License | github.com/necolas/normalize.css *//** * 1. Change the default font family in all browsers (opinionated). * 2. Prevent adjustments of font size after orientation changes in IE and iOS. */html { font-family: sans-serif; /* 1 */ -ms-text-size-adjust: 100%; /* 2 */ -webkit-text-size-adjust: 100%; /* 2 */}/** * Remove the margin in all browsers (opinionated). */body { margin: 0;}/* HTML5 display definitions ========================================================================== *//** * Add the correct display in IE 9-. * 1. Add the correct display in Edge, IE, and Firefox. * 2. Add the correct display in IE. */article,aside,details, /* 1 */figcaption,figure,footer,header,main, /* 2 */menu,nav,section,summary { /* 1 */ display: block;}/** * Add the correct display in IE 9-. */audio,canvas,progress,video { display: inline-block;}/** * Add the correct display in iOS 4-7. */audio:not([controls]) { display: none; height: 0;}/** * Add the correct vertical alignment in Chrome, Firefox, and Opera. */progress { vertical-align: baseline;}/** * Add the correct display in IE 10-. * 1. Add the correct display in IE. */template, /* 1 */[hidden] { display: none;}/* Links ========================================================================== *//** * 1. Remove the gray background on active links in IE 10. * 2. Remove gaps in links underline in iOS 8+ and Safari 8+. */a { background-color: transparent; /* 1 */ -webkit-text-decoration-skip: objects; /* 2 */}/** * Remove the outline on focused links when they are also active or hovered * in all browsers (opinionated). */a:active,a:hover { outline-width: 0;}/* Text-level semantics ========================================================================== *//** * 1. Remove the bottom border in Firefox 39-. * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari. */abbr[title] { border-bottom: none; /* 1 */ text-decoration: underline; /* 2 */ text-decoration: underline dotted; /* 2 */}/** * Prevent the duplicate application of `bolder` by the next rule in Safari 6. */b,strong { font-weight: inherit;}/** * Add the correct font weight in Chrome, Edge, and Safari. */b,strong { font-weight: bolder;}/** * Add the correct font style in Android 4.3-. */dfn { font-style: italic;}/** * Correct the font size and margin on `h1` elements within `section` and * `article` contexts in Chrome, Firefox, and Safari. */h1 { font-size: 2em; margin: 0.67em 0;}/** * Add the correct background and color in IE 9-. */mark { background-color: #ff0; color: #000;}/** * Add the correct font size in all browsers. */small { font-size: 80%;}/** * Prevent `sub` and `sup` elements from affecting the line height in * all browsers. */sub,sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline;}sub { bottom: -0.25em;}sup { top: -0.5em;}/* Embedded content ========================================================================== *//** * Remove the border on p_w_picpaths inside links in IE 10-. */img { border-style: none;}/** * Hide the overflow in IE. */svg:not(:root) { overflow: hidden;}/* Grouping content ========================================================================== *//** * 1. Correct the inheritance and scaling of font size in all browsers. * 2. Correct the odd `em` font sizing in all browsers. */code,kbd,pre,samp { font-family: monospace, monospace; /* 1 */ font-size: 1em; /* 2 */}/** * Add the correct margin in IE 8. */figure { margin: 1em 40px;}/** * 1. Add the correct box sizing in Firefox. * 2. Show the overflow in Edge and IE. */hr { box-sizing: content-box; /* 1 */ height: 0; /* 1 */ overflow: visible; /* 2 */}/* Forms ========================================================================== *//** * 1. Change font properties to `inherit` in all browsers (opinionated). * 2. Remove the margin in Firefox and Safari. */button,input,select,textarea { font: inherit; /* 1 */ margin: 0; /* 2 */}/** * Restore the font weight unset by the previous rule. */optgroup { font-weight: bold;}/** * Show the overflow in IE. * 1. Show the overflow in Edge. */button,input { /* 1 */ overflow: visible;}/** * Remove the inheritance of text transform in Edge, Firefox, and IE. * 1. Remove the inheritance of text transform in Firefox. */button,select { /* 1 */ text-transform: none;}/** * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video` * controls in Android 4. * 2. Correct the inability to style clickable types in iOS and Safari. */button,html [type="button"], /* 1 */[type="reset"],[type="submit"] { -webkit-appearance: button; /* 2 */}/** * Remove the inner border and padding in Firefox. */button::-moz-focus-inner,[type="button"]::-moz-focus-inner,[type="reset"]::-moz-focus-inner,[type="submit"]::-moz-focus-inner { border-style: none; padding: 0;}/** * Restore the focus styles unset by the previous rule. */button:-moz-focusring,[type="button"]:-moz-focusring,[type="reset"]:-moz-focusring,[type="submit"]:-moz-focusring { outline: 1px dotted ButtonText;}/** * Change the border, margin, and padding in all browsers (opinionated). */fieldset { border: 1px solid #c0c0c0; margin: 0 2px; padding: 0.35em 0.625em 0.75em;}/** * 1. Correct the text wrapping in Edge and IE. * 2. Correct the color inheritance from `fieldset` elements in IE. * 3. Remove the padding so developers are not caught out when they zero out * `fieldset` elements in all browsers. */legend { box-sizing: border-box; /* 1 */ color: inherit; /* 2 */ display: table; /* 1 */ max-width: 100%; /* 1 */ padding: 0; /* 3 */ white-space: normal; /* 1 */}/** * Remove the default vertical scrollbar in IE. */textarea { overflow: auto;}/** * 1. Add the correct box sizing in IE 10-. * 2. Remove the padding in IE 10-. */[type="checkbox"],[type="radio"] { box-sizing: border-box; /* 1 */ padding: 0; /* 2 */}/** * Correct the cursor style of increment and decrement buttons in Chrome. */[type="number"]::-webkit-inner-spin-button,[type="number"]::-webkit-outer-spin-button { height: auto;}/** * 1. Correct the odd appearance in Chrome and Safari. * 2. Correct the outline style in Safari. */[type="search"] { -webkit-appearance: textfield; /* 1 */ outline-offset: -2px; /* 2 */}/** * Remove the inner padding and cancel buttons in Chrome and Safari on OS X. */[type="search"]::-webkit-search-cancel-button,[type="search"]::-webkit-search-decoration { -webkit-appearance: none;}/** * Correct the text style of placeholders in Chrome, Edge, and Safari. */::-webkit-input-placeholder { color: inherit; opacity: 0.54;}/** * 1. Correct the inability to style clickable types in iOS and Safari. * 2. Change font properties to `inherit` in Safari. */::-webkit-file-upload-button { -webkit-appearance: button; /* 1 */ font: inherit; /* 2 */}