I’m posting it just to show the things that I’ve changed on my Tumblr. Maybe someone wants to know what I’ve done. xD

I’m using the Radux theme modified, usually the background, button color and head are easily changed without using HTML code.

But to make modifications on the columns and add some stuffs you have to use the code, and I’ll show some that I’ve used.  

Columns: To change the color and put some opacity, I did a simple thing:

#wrapper #content .post {

                    font-family: {font:Body};

                    background: rgba(0, 0, 0, 0.8);

the 3 firsts 0 represents the color, red, green and blue, and the values goes to 0 from 255.
If you want a white column, just put 255,255,255.
To find the colors you can open the Photoshop or the Paint and look for it on Edit Colors. In Photoshop situation when you choose the color, you can see the numbers. 
The 0.8 represents the opacity, the smaller number makes it more transparent.

#wrapper #sidebar #top {

                    background: rgba(0, 0, 0, 0.8); [this is the small column.]  

To not let this post too big, I’ll create an other post with the sparkles code, and another showing how to insert the likes.

See you! ^^