Hi Ton
1. Updating your template to the latest download should resolve this issue for you. For details on updating your template may I suggest the following article..
https://joomla51.com/tutorials/joomla-basics/updating-your-joomla-template
If the issue persists after updating, may I suggest sending temporary administration access to your Joomla installation to info@joomla51.com and we will examine this issue further. For our reference please paste a link to this post in your email.
2. / 3. To amend you can add the following to the
Responsive Custom CSS fields within the
General -> Responsive Options tab of your template settings. For more details on using these fields may I suggest the following article...
https://joomla51.com/tutorials/template-parameters/applying-custom-css-to-a-screensize-device
(edit to taste)
.logo {
padding-right: 0;
}
.logo h1 a {
font-size: 2.2rem;
}
Ciaran