#mid {
    width: 100%;
    box-sizing: border-box;
    padding: 20px;
    background-color: #fff;
}

#mid p {
    line-height: 30px;
    text-indent: 32px;
}

#mid_content {
    margin-top: 20px;
}

.picture {
    float: left;
    width: 400px;
    margin-right: 20px;
}

.picture1 {
    width: 500px;
    float: right;
    margin-left: 20px;
}

.picture2 {
    width: 100%;
    margin-top: 20px;
}