html,
body,
h1,
h2,
h3,
h4,
h5,
h6,
ul,
li,
ol,
div,
p {
    padding: 0;
    margin: 0;
}

body {
    max-width: 750px;
    min-width: 320px;
    margin: 0 auto;
    font-family: "IBM Plex Serif";
    -webkit-font-smoothing: antialiased;
}

ul {
    list-style-type: none;
}

a {
    text-decoration: none;
}

.dis_flex_center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.dis_flex_between {
    display: flex;
    justify-content: space-between;
}

.dis_flex_around {
    display: flex;
    justify-content: space-around;
}

.dis_flex_evenly {
    display: flex;
    justify-content: space-evenly;
}

.dis_flex_center {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 高度坍塌 */

.high_collapse::before {
    content: '';
    display: table;
}

.svg_img {
    vertical-align: middle;
}

.img_100 {
    width: 100%;
}