* {
    box-sizing: border-box;
    outline: none;
    font-family: "Source Han Sans CN", -apple-system, sans-serif;
    -webkit-appearance: none;
    appearance: none;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: none;
    -moz-text-size-adjust: none;
    text-size-adjust: none;
}

body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
code,
form,
fieldset,
legend,
input,
textarea,
p,
blockquote,
th,
td {
    margin: 0;
    padding: 0;
}

h1,
h2,
h3 {
    font-weight: normal;
    margin-top: 0;
    margin-bottom: 0;
    line-height: 1.5em;
}

.wrapper {
    width: 1280px;
    padding-left: 40px;
    padding-right: 40px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    margin-bottom: 30px;
    line-height: 30px;
    padding-left: 18px;
    position: relative;
    font-size: 26px;
}

.section-title::before {
    content: "";
    width: 3px;
    height: 100%;
    background-color: #ff0000;
    position: absolute;
    left: 0;
    top: 0;
}

.block img{
    display: block;
    width: 100%;
    height: auto;
}

@media (max-width: 1280px) {
    .wrapper {
        width: 960px;
        padding-left: 30px;
        padding-right: 30px;
    }
}

@media (max-width: 960px) {
    .wrapper {
        padding-left: 20px;
        padding-right: 20px;
        width: 100%;
    }

    .step-block-list .block {
        width: calc(50% - 20px);
        margin-bottom: 20px;
    }
}

@media (max-width: 640px) {
    .step-block-list .block {
        width: calc(100% - 20px);
        margin-bottom: 20px;
    }
}

.step-block-list {
    margin-top: 24px;
    display: flex;
    flex-wrap: wrap;
    margin-right: -19.5px;
}

.block {
    width: calc(100% / 3 - 20px);
    margin-right: 20px;
    flex: 0 0 auto;
    border: 1px solid #d5d5d5;
    margin-bottom: 30px;
}

.step-block-list .block img {
    width: 100%;
    height: auto;
}
.step-block-list .block .title{
   line-height: 50px;
   background-color: #d5d5d5;
   margin-top: -4px;
   font-size: 16px;
   padding-left: 38px;
   position: relative;
   overflow: hidden;
   white-space: nowrap;
   text-overflow: ellipsis;
}
.step-block-list .block .title::before{
    content: '';
    width: 8px;
    height: 10px;
    background: url('./images/j.png') no-repeat;
    background-size: cover;
    position: absolute;
    top: 20px;
    left: 20px;
}