body {
    padding: 0;
    margin: 0;
    font-family: "Helvetica Neue", Helvetica, "Hiragino Sans GB", Arial, "Microsoft YaHei", 微软雅黑, STHeiti, "WenQuanYi Micro Hei", "PingFang SC", SimSun, sans-serif;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

a {
    text-decoration: none;
}

.left {
    float: left;
}

.right {
    float: right;
}

.top40 {
    margin-top: 40px;
}

.top100 {
    margin-top: 100px;

}

.child_left {
    text-align: left;
}

.child_right {
    text-align: right;
}


.clear::after {
    content: "";
    clear: both;
    display: block;
}


.none_display {
    display: none;
}

/* 上升下降 */
.domup {
    visibility: visible;
    animation-duration: 1.2s;
    animation-delay: 0s;
    animation-iteration-count: 1;
    animation-name: fadeInUp;
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        -webkit-transform: translate3d(0, 100%, 0);
        transform: translate3d(0, 100%, 0)
    }

    to {
        opacity: 1;
        -webkit-transform: none;
        transform: none
    }
}

.domdowm {
    visibility: visible;
    animation-duration: 0.9s;
    animation-delay: 0s;
    animation-iteration-count: 1;
    animation-name: fadeInDown;
}

.domVOpen {
    transition: 0.5s;
    transform: scaleY(1);
}

@keyframes fadeInDown {
    0% {
        opacity: 0;
        -webkit-transform: translate3d(0, -100%, 0);
        transform: translate3d(0, -100%, 0)
    }

    to {
        opacity: 1;
        -webkit-transform: none;
        transform: none
    }
}


/* 缩放 */
.zoom_view {
    transition: all 0.3s;
}

.zoom_view:hover {
    transform: scale(1.15);
}

.mt30 {
    margin-top: 30px;
}

.mb30 {
    margin-bottom: 30px;
}

.mt50 {
    margin-top: 50px;
}

.mb50 {
    margin-bottom: 50px;
}

.one_type_title {
    text-align: center;
    font-size: 35px;
    color: black;
    margin-top: 50px;
    margin-bottom: 50px;
}


/* 标题 */
.maintitle {
    text-align: center;
    font-size: 36px;
    color: #333333;
    letter-spacing: 5px;
    width: 85%;
    margin-left: auto;
    margin-right: auto;
}

.subtitle {
    text-align: center;
    color: rgb(153, 153, 153);
    font-family: "Microsoft YaHei", 微软雅黑, MicrosoftJhengHei, 华文细黑, STHeiti, MingLiu;
    font-size: 16px;
    margin-top: 20px;
    width: 85%;
    margin-left: auto;
    margin-right: auto;
}

/* 当屏幕宽度小于1100px的时候 */
@media screen and (max-width:740px) {
    .one_type_title {
        font-size: 20px;
        margin-top: 30px;
        margin-bottom: 30px;
    }
}