html,
body,
h1,
h2,
h3,
h4,
h5,
h6,
div,
dl,
dt,
dd,
ul,
ol,
li,
p,
blockquote,
pre,
hr,
figure,
table,
caption,
th,
td,
form,
fieldset,
legend,
input,
button,
textarea,
menu,
a {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

ul,
li {
    list-style: none;
}

a {
    list-style: none;
    text-decoration: none;
    color: #333333;
}

.w1200 {
    width: 1200px;
    margin: 0px auto;
}

.first img,
.topImg img {
    width: 100%;
    height: 100%;
    min-width: 1200px;
}

.leftCon li.active a {
    color: #3a78c1;
}