Full Width Button Icon

Yes – but i would advice you to have “buttons” on small screens underneath each other.

if you know how to insert the shortcode here is the shortcode of that layout:

[av_layout_row border='' min_height_percent='percent' min_height_pc='35' min_height='0' color='main_color' mobile='av-flex-cells' id='' av_element_hidden_in_editor='0' mobile_breaking='' av_uid='av-jz6fxoy1' custom_class='']
[av_cell_one_third vertical_align='middle' padding='30px' padding_sync='true' background='bg_color' background_color='#38a8da' background_gradient_color1='' background_gradient_color2='' background_gradient_direction='vertical' src='' attachment='' attachment_size='' background_attachment='scroll' background_position='top left' background_repeat='no-repeat' link='manually,#' linktarget='' link_hover='' mobile_display='' av_uid='av-jz6fvtyh' custom_class='']

[av_font_icon icon='ue84d' font='entypo-fontello' style='border' caption='' link='manually,#' linktarget='' size='40px' position='center' animation='' color='#ffffff' av_uid='av-jz6fyjec' custom_class='' admin_preview_bg=''][/av_font_icon]

[av_heading heading='— Renting Process —' tag='h2' link_apply='' link='manually,http://' link_target='' alt_attr='' style='blockquote modern-quote modern-centered' size='' subheading_active='' subheading_size='15' id='' margin='' padding='10' color='custom-color-heading' custom_font='#ffffff' custom_class='' admin_preview_bg='' av-desktop-hide='' av-medium-hide='' av-small-hide='' av-mini-hide='' av-medium-font-size-title='' av-small-font-size-title='' av-mini-font-size-title='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' av_uid='av-1fveu9n'][/av_heading]

[/av_cell_one_third][av_cell_one_third vertical_align='middle' padding='30px' padding_sync='true' background='bg_color' background_color='#a7a7a7' background_gradient_color1='' background_gradient_color2='' background_gradient_direction='vertical' src='' attachment='' attachment_size='' background_attachment='scroll' background_position='top left' background_repeat='no-repeat' link='manually,#' linktarget='' link_hover='' mobile_display='' av_uid='av-jz6fvyc9' custom_class='']

[av_font_icon icon='ue80b' font='entypo-fontello' style='border' caption='' link='manually,#' linktarget='' size='40px' position='center' animation='' color='#ffffff' av_uid='av-jz6fyjec' custom_class='' admin_preview_bg=''][/av_font_icon]

[av_heading heading='— Sellers Guide —' tag='h2' link_apply='' link='manually,http://' link_target='' alt_attr='' style='blockquote modern-quote modern-centered' size='' subheading_active='' subheading_size='15' id='' margin='' padding='10' color='custom-color-heading' custom_font='#ffffff' custom_class='' admin_preview_bg='' av-desktop-hide='' av-medium-hide='' av-small-hide='' av-mini-hide='' av-medium-font-size-title='' av-small-font-size-title='' av-mini-font-size-title='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' av_uid='av-16oz9iz'][/av_heading]

[/av_cell_one_third][av_cell_one_third vertical_align='middle' padding='30px' padding_sync='true' background='bg_color' background_color='#e83947' background_gradient_color1='' background_gradient_color2='' background_gradient_direction='vertical' src='' attachment='' attachment_size='' background_attachment='scroll' background_position='top left' background_repeat='no-repeat' link='manually,#' linktarget='' link_hover='' mobile_display='' av_uid='av-jz6fw4u3' custom_class='']

[av_font_icon icon='ue821' font='entypo-fontello' style='border' caption='' link='manually,#' linktarget='' size='40px' position='center' animation='' color='#ffffff' av_uid='av-jz6fyjec' custom_class='' admin_preview_bg=''][/av_font_icon]

[av_heading heading='— Buyers Guide —' tag='h2' link_apply='' link='manually,http://' link_target='' alt_attr='' style='blockquote modern-quote modern-centered' size='' subheading_active='' subheading_size='15' id='' margin='' padding='10' color='custom-color-heading' custom_font='#ffffff' custom_class='' admin_preview_bg='' av-desktop-hide='' av-medium-hide='' av-small-hide='' av-mini-hide='' av-medium-font-size-title='' av-small-font-size-title='' av-mini-font-size-title='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' av_uid='av-kbfs1n'][/av_heading]

[/av_cell_one_third]
[/av_layout_row]

you can decide if you like to have column link or link on icon and heading ( you then must synchronize it)
looks this way: https://webers-testseite.de/pseudobuttons/

there are small borders (allthough this is not selected on grid alb element) these comes from width 33,3 % width if the width was defined as 33,33% it is not shown – but it might get in to problems on different browsers.
Easier to solve that problem is to give to the whole gird-row a the background-color of the middle column:

#av-layout-grid-1 {
    background-color: #a7a7a7;
}