body {
    font-family: 'pingfang SC', 'helvetica neue', arial, 'hiragino sans gb', 'microsoft yahei ui', 'microsoft yahei', simsun, sans-serif;
}

.navbar-brand {
    background-image: url("img/logo.png");
    background-size: cover;
    width: 75px;
    text-indent: -1000px;
    overflow: hidden;
}

.carousel-item {
    height: 600px;
    color: #fff;
    background-color: #ddd;
    background-image: url("img/banner-1.jpg");
    background-size: cover;
}

.carousel-item .d-flex {
    height: 600px;
}

.d_1 {
    height: 600px;
    background-image: url("img/background.jpg");
    background-size: cover;
}

.d_2 {
    height: 600px;
    background-image: url("img/1736x940-1.png");
    background-size: contain;
    background-position: 70% center;
    background-repeat: no-repeat;
    color: #fff;
    background-color: #1c5eab;
}

.d_3 .img,
.d_4 .img {
    background-color: #ddd;
    height: 416px;
    background-image: url("img/776x500-1.jpg");
    background-size: cover;
    text-indent: -1000px;
    overflow: hidden;
}

.d_3 .img_2 {
    background-image: url("img/776x500-2.jpg");
}

.d_3 .img_3 {
    background-image: url("img/776x500-3.jpg");
}

.d_4 .img_1 {
    background-image: url("img/800x936-1.jpg");
}

.d_4 .img_2 {
    background-image: url("img/800x936-2.jpg");
}

.d_4 .img_3 {
    background-image: url("img/800x936-3.jpg");
}