Vamsi

Download the original theme and check if the file …./customizr/inc/init.php
it should be there, since functions.php is trying to include it.

Using your hosting cpanel, upload the init.php file to the same directory(i.e …./customizr/inc/).

And then try .. !

For the first one, may be removing opacity property should work.

Check your SETTINGS->MEDIA, sometimes themes fetch sizes from there.!

Making #menu-base-navigation{ margin-left:-40px} feels like it is centered

Try changing your nav text-align

nav {
 text-align:left;
}

Find this code in your files and change the color white to something else.

.widget_categories li:visited, .widget_archive li:visited, .read_more_button:visited, .action_button a:visited, a[rel~="category"]:visited, .tagcloud a:visited, .rev_slider .tp-button:visited, ul.sub-menu a:visited {
    color: orange; /* Orginal is 'white' */
}

It will be easy if you provide a fiddle or your website like. [Link moderated and replaced with the below content]

1. HTML for horizontal navigation bar

<div class="header-navigation">
    <div class="navigation">
        <span class="nav-item v-center"><a href="/one">Featured</a></span>
         <span class="nav-item v-center"><a href="/two">News</a></span>
         <span class="nav-item v-center"><a href="/three">Sports</a></span>
         <span class="nav-item v-center"><a href="/for">Music</a></span>
         <span class="nav-item v-center"><a href="/five">Entertainment</a></span>
    </div>
</div>

2. CSS for the twitter style navigation bar

.header-navigation {

    background-color:#fff;
    font-family:'Arial';
    border:1px solid #e1e8ed;
    border-bottom:1px solid #e1e8ed;
}

.navigation {
    width:900px;
    margin-left:auto;
    margin-right:auto;
    font-size:20px;
    height:60px;
}
.navigation .nav-item {
    float:left;
}

.navigation .nav-item a {
    padding:20px 40px 19px 40px;
    text-decoration:none;
    color:#55acee;
    border-right:1px solid #e1e8ed;
    transition: box-shadow 100ms ease;
 }
.navigation .nav-item:last-child a{
    border-right:none;
}
.navigation .nav-item a:hover {
   box-shadow: 0 -15px 0 -10px #55acee inset;
 }
.v-center {
    text-align:center;
    position:relative;
    top:50%;
    transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
}

In Your css make

#primary {float:right;}
#secondary {float:left;}

Download the original theme and replace single post php with the orginal one. Go from there. Next try to insert your ad code carefully.

There are multiple ways to do this. One way I would do is to make those pages belong to a category(this cat is not for public). And in your template, you can check if the page belong to that category display special logo else display other logo.

Find the function that is rendering your shortcode and add define a class to the wrapper “CALL US”.

Add css to that class to align center.

Or paste your link. I will check if anything can be done just adding css.

3. Color of subscription button:

You can add class to the submit button something like
<input type=”submit” class=”my-colored-submit” value=”subscribe”/>

and then add css to the element.

.widget .my-colored-submit input[type=”submit”]:hover,
.widget .my-colored-submit input[type=”submit”]:focus {
background-color: red; /* Your choice of color */
}

You can simple hide with css. Edither you can edit the css file that contains the below css class-selector or you can add this to your style.css

.mythemes-post-social {
display:none;
}

There are called shortcodes. Your theme files should you the functions corresponding to those shortcodes.

You can find more information from here https://codex.www.ads-software.com/Shortcode_API

Provide your website link.

Also, check if any plugins or custom css, sometimes those could be causing issues.