html { -ms-text-size-adjust: 100%; -webkit-text-size-adjust: 100%; }

body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, p, pre, code, form, fieldset, legend, blockquote { margin: 0; padding: 0; }

*, *:before, *:after { -moz-box-sizing: border-box; box-sizing: border-box; }

h1, h2, h3, h4, h5, h6 { font-size: 100%; font-weight: normal; }

a { text-decoration: none; background-color: transparent; }

a:active, a:hover { outline: 0; }

b, strong { font-weight: bold; }

sub, sup { position: relative; vertical-align: baseline; }

em { font-style: normal; }

img { max-width: 100%; vertical-align: middle; border: 0; -ms-interpolation-mode: bicubic; }

svg:not(:root) { overflow: hidden; }

button, input, optgroup, select, textarea { color: inherit; font: inherit; margin: 0; }

button { overflow: visible; }

button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0; }

button, select { text-transform: none; }

button, input { line-height: normal; padding: 0; }

button, html input[type="button"], input[type="reset"], input[type="submit"] { -webkit-appearance: button; cursor: pointer; }

button[disabled], html input[disabled] { cursor: default; }

input[type="checkbox"], input[type="radio"] { -moz-box-sizing: border-box; box-sizing: border-box; padding: 0; }

input[type="number"]::-webkit-inner-spin-button, input[type="number"]::-webkit-outer-spin-button { height: auto; }

input[type="search"] { -webkit-appearance: textfield; -moz-box-sizing: content-box; box-sizing: content-box; }

input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; }

input[type="button"], input[type="submit"], input[type="reset"], input[type="file"]::-webkit-file-upload-button, button { box-sizing: content-box; }

textarea { overflow-y: auto; resize: vertical; }

:focus { outline: none; }

table { border-collapse: collapse; border-spacing: 0; }

th { font-weight: normal; }

ul, ol { list-style: none outside none; }

html, body { background: #fff; }

body { min-width: 1200px; font-family: "Microsoft YaHei","Helvetica Neue",Helvetica,Arial,STXihei,sans-serif; font-size: 14px; line-height: 1.5; color: #333; }

input, textarea, select, button { font-size: 100%; font-family: inherit; color: inherit; }

button { border: 0; }

b { font-weight: normal; }

a { color: #333; text-decoration: none; cursor: pointer; }

.theme-bg { position: relative; height: 100vh; background: url(../images/bg.jpg) top center no-repeat; background-size: 100%; }
.main { width:1200px; min-height:900px; margin:0 auto; display: flex; align-items: center;}
.main img {width: 1200px; height: 780px; align-items: center;}