Click “edit” of TextBlock, change background color here: https://www.dropbox.com/s/740v2c2sg1oiuh8/QQ20160316-0.jpg?dl=0

It needs change the theme files:
– /functions/theme/options/options-config.php
line 76-85:

array('id' => 'color1', 'value' => 'theme-color-1', 'rgb' => '#F9885C'),
		array('id' => 'color2', 'value' => 'theme-color-2', 'rgb' => '#BD9DD1'),
		array('id' => 'color3', 'value' => 'theme-color-3', 'rgb' => '#F1A1C3'),
		array('id' => 'color4', 'value' => 'theme-color-4', 'rgb' => '#92C3E3'),
		array('id' => 'color5', 'value' => 'theme-color-5', 'rgb' => '#5B6A81'),
		array('id' => 'color6', 'value' => 'theme-color-6', 'rgb' => '#858687'),
		array('id' => 'color7', 'value' => 'theme-color-7', 'rgb' => '#69CE9B'),
		array('id' => 'color8', 'value' => 'theme-color-8', 'rgb' => '#fbd44d'),
		array('id' => 'color9', 'value' => 'theme-color-9', 'rgb' => '#c9b69d'),
		array('id' => 'color10', 'value' => 'theme-color-10', 'rgb' => '#313139')

– /styles/pagebuild.css
line 19-78

.theme-color-1{ color:#DE5F4C;}
.theme-color-2{ color:#be9ecd;}
.theme-color-3{ color:#f67bb5;}
.theme-color-4{ color:#8FC4E0;}
.theme-color-5{ color:#5a6b7f;}
.theme-color-6{ color:#858687;}
...
.fullwidth-text-white .moudle .ux-btn.bg-theme-color-7-hover:hover{ color:#2ECC80!important; }
.fullwidth-text-white .moudle .ux-btn.bg-theme-color-8-hover:hover{ color:#fbd44d!important; }
.fullwidth-text-white .moudle .ux-btn.bg-theme-color-9-hover:hover{ color:#c9b69d!important; }
.fullwidth-text-white .moudle .ux-btn.bg-theme-color-10-hover:hover{ color:#28282E!important; }

If you changed the 2nd color,
go to Theone / General Settings / Custom Css
Paste the style code to Custom Css(change as your color value):
.bg-theme-color-2 { background-color:#be9ecd;}