Whitening the search background

The 0.4.3 version of sphinx_rtd_theme supports the possiblity to change
background of the search area. This change modifies the background to
white to make it inline with the ONAP logo.

Issue-ID: DOC-402

Change-Id: I5156cf0ed146e12d9dbd2b5685a7ff563a88f6a2
Signed-off-by: Gergely Csatari <gergely.csatari@nokia.com>
diff --git a/docs/conf.py b/docs/conf.py
index fc96b8b..83601da 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -137,7 +137,7 @@
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-#html_theme_options = {}
+html_theme_options = {'style_nav_header_background': 'white'}
 
 # Add any paths that contain custom themes here, relative to this directory.
 #html_theme_path = sphinx_bootstrap_theme.get_html_theme_path()