* {
    box-sizing: border-box;
}

.contents {
    margin-top: 50px;
}
h1 {
    text-align: center;
    margin: 60px 0 30px;
}

p {
    font-size: 16px;
}

.p-3 {
    padding: 15px !important;
}

.bg-hui {
    background: rgb(57, 62, 66);
    color: #fff;
}

.contact-btn {
    display: inline-block;
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    margin-top: 10px;
    border-radius: 5px;
    padding: 15px 50px;
    background-color: #2d6daf;
    border: 1px solid #2d6daf;

}

.contact-btn:hover {
    color: #2d6daf;
    background-color: #fff;
}

.process {
    position: relative;
}

.number {
    position: absolute;
    top: 30px;
    left: 0;
    line-height: 0;
    z-index: -1;
    font-size: 5rem;
    color: whitesmoke;
    font-weight: 900;
}

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

img {
    width: 100%;
    height: auto;
}

.col-3 {
    width: 25%;
}

.col-4 {
    width: 33.33%;
}

.col-6 {
    width: 50%;
}

.col-3,
.col-4,
.col-6 {
    float: left;
    padding: 10px;
}


.jianjie {
    display: inline-block;
    padding: 0 20px;
    margin: 0 20ox;
}

@media screen and (max-width: 768px) {
    .col-6 {
        width: 100%;
        padding: 0;
    }

    .jianjie {
        display: inline-block;
        padding: 0 10px;
        margin: 0 10ox;
    }

    .col-3 {
        width: 100%;
    }

    .col-4 {
        width: 100%;
    }
}