Take a look at line 1974 in your css file and remove some of the padding from here –
.header-image .site-header .widget-area {
padding: 0 0;
padding: 2.5rem 0;
padding-top: 0;
}
I would change the above code to look like this instead –
.header-image .site-header .widget-area {
padding: 0;
}