About the vertical centering of the background map relative to the parent container

<Divclass= "Register-wrapper">                <Divclass= "Register">                    <H1><spanclass= "Icons Icons-home"></span>XXX website homepage!</H1>                    <Divclass= "Register-links-wrapper">                        <ulclass= "Register-links">                            <Liclass= "Icons Icons-sina"></Li>                            <Liclass= "Icons Icons-qq"></Li>                            <Liclass= "Login"><ahref="#">Login</a></Li>                                <Liclass= "Regis"><ahref="#">Registered</a></Li>                        </ul>                    </Div>                </Div>            </Div>

/*top level of register head*/. Register-wrapper{width:100%;Background-color:#dcdcdc;Margin-bottom:30px;}. Register{width:1000px;Height:30px;margin:0 Auto;}. Register-wrapper{Line-height:30px;}. Register H1{Display:Inline-block;font-size:12px;Color:#898989;}. Register Span,.collection span{Display:Inline-block;}/*S Import Small icon*/. Icons{Display:Inline-block;background:URL (.. /images/icons.png) No-repeat Center Center;}. Icons-home{width:14px;Height:12px;background-position:0 0;Margin-right:5px;}. Icons-sina{width:25px;Height:22px;background-position:-30px 0;}. ICONS-QQ{width:25px;Height:22px;background-position:-60px 0;}. Icons-coll{width:10px;Height:22px;background-position:-90px 0;}/*E Import Small icon*//*top of the head link*/. Register-links-wrapper{Display:Inline-block;float: Right;}. register-links Li{Display:Inline-block;Margin-right:5px;}. Register-links Li a{Display:Inline-block;font-size:12px;Color:#34bf82;Margin-left:5px;}. Register-links Li:last-child:before{content:"|";Color:#34bf82;}

I don't know why. In this code, the background of Sina and QQ [1] is a single label wrapped up. Landing and registration [2] Also, when setting [1] height, [2] The height also changed accordingly. Where's the problem??

Import the background map, how to make it vertically centered relative to the parent container??

About the vertical centering of the background map relative to the parent container