@lech

Can you link to your website so I can have a look?

If you set a fixed height you will also have to set another height for mobile devices.

You can add the same CSS code to the Media Queries at the bottom of the style.css file.

Around line 1735 you will see this,

@media (max-width: 767px)

You can then specify a different height for mobile devices.

Here is a list of Media Queries and what devices they correspond to,

/* Large Devices, Wide Screens */
@media only screen and (max-width : 1200px) {

}

/* Medium Devices, Desktops */
@media only screen and (max-width : 992px) {

}

/* Small Devices, Tablets */
@media only screen and (max-width : 768px) {

}

/* Extra Small Devices, Phones */
@media only screen and (max-width : 480px) {

}

/* Custom, iPhone Retina */
@media only screen and (max-width : 320px) {

}