Change Block Menu display position


I have this site:

And i want that search be in middle of logotipo and login but i can’t understand how to do it, i have this code:

/* line 147, ../sass/screen.sass */
.region-header {
clear: right;
float: right;
max-width: 50%;

And i change it to a lot of things i clear cache and i see changes but the search block and login menu keeps together… i can’t make this search block in middle of both…

Please help me

Drupal version: