*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
#reg_header{
    height: 110px;
    width: 100%;
    box-shadow: 0px 0px 10px orange;
}

#reg_header .reg_h_center{
    width: 1200px;
    height: 110px;
    margin: 0 auto;
    display: flex;
}
#reg_header .reg_h_left{
    height: 110px;
    flex: 1;
}

#reg_header .reg_h_left img{
    height: 100px;
    width: 120px;
    float: left;
}
#reg_header .reg_h_left h3{
    float: left;
    margin-top: 80px;
    margin-left: 10px;
}
#reg_header .reg_h_right{
    height: 110px;
    flex: 1;
    padding-top: 50px;
    padding-left: 30px;
}


.reg_back {
    /*设置整体的尺寸、背景色、边距等*/
    width: 850px;
    height: 400px;
    border: 8px solid #eeeeee;
    background: white;
    margin: auto;
    margin-top: 20px;
}

.reg_left {
    /*设置左浮动和外边距*/
    float: left;
    margin: 10px;
}

.reg_left > p:first-child {
    /*设置段落（新用户注册）颜色和字体大小*/
    color: gray;
    font-size: 20px;
}

.reg_left > p:last-child {
    /*设置段落（USER REGISTER）颜色和字体大小*/
    color: #A6A6A6;
    font-size: 20px;
}

.reg_center {
    /*设置中间的各种输入框等*/
    float: left;
    width: 450px;
}

.reg_right {
    /*设置右边段落浮动和外间距*/
    float: right;
    margin: 30px;
}

.reg_right > p:first-child {
    font-size: 15px;
}

.reg_right p a {
    /*设置超链接（立即登录）颜色*/
    color: crimson;
}

.td_left {
    /*设置表单中字体对齐方式和宽度、高度*/
    width: 100px;
    text-align: right;
    height: 40px;
}

.td_right {
    /*设置输入框内边距*/
    padding-left: 40px;
}

#username ,#password,#Email, #rename ,#Telphone,#Birthday,#checkcode{
    /*设置输入框大小和边框*/
    width: 200px;
    height: 30px;
    border: 1px solid #A4A4A4;
    /* 设置边框为圆角 */
    border-radius: 8px;
    padding-left: 10px;
}
#checkcode{
    /*验证码宽度*/
    width: 100px;
}
#img_check{
    /*验证码图片*/
    vertical-align: middle;
    height: 30px;
    width: 95px;
}
#btn_sub{
    /*注册按钮*/
    margin-left: 50px;
    background: orangered;
    color: whitesmoke;
    width: 150px;
    height: 40px;
    border: 1px solid gray ;
}