Beginner need help on center the logo & responsive on mobile layout

Hi,

Need help....

I been tried to align the logo to center of the page, unfortunately it was failed.
my logo size
width : 500px;
height :338px

header.php

params->get('sitename') ? $this->params->get('sitename') : JFactory::getConfig()->get('sitename');

$slogan = $this->params->get('slogan');

$logotype = $this->params->get('logotype', 'text');

$logoimage = $logotype == 'image' ? $this->params->get('logoimage', '') : '';

if ($logoimage) {

  $logoimage = ' style="background-image: url('/.JURI::base(true').'/'.$logoimage.');"';

}

?>        

          a href="http://t3-framework.org//" title="">

here is my site : www.beauty-injections.com

i also found out that the logo is not responsive on mobile layout. can anyone help.


Thanks in advance