@stjosephschool, thank you for using Education Hub Pro theme.

You can tweak this requirement through custom CSS code as given below :

.home #primary {
width : 70%
}

.home #sidebar-primary {
    width: 28%;
}

Please paste the above code in Appearance -> Customize -> Theme Options -> Advance Options -> Custom CSS

Write us back if you still have any issue.

Best Regards,

Sure. You can edit (or replace) the above second part of the code to add the background color and inner padding css property like the one given below.

.home #sidebar-primary {
    width: 28%;
    background: #fff;
    padding-top: 25px;
}