html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
a{
    text-decoration: none;
    color: #333;
}
img{
    width: 100%;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
    background-color: #F2F4F6;
}
ul, li{
    list-style: none;
}
.mt20{
    margin-top: 20px;
}
.mt30{
    margin-top: 30px;
}
.mt40{
    margin-top: 40px;
}
.mt50{
    margin-top: 50px;
}
.flex{
    display: flex;
    align-items: center;
}
.main{
    width: 1100px;
    margin: 0 auto;
}
.white{
    color: #fff;
}
.bg-white{
    background-color: #fff;
}