Logo Position

Hello all. I have a problem I am trying to move my sydney theme logo all the way to the left. I went to my dashboard on wordpress, then went to apperance, customize and under Site title/tagline/logo, I imported my image. Then i went all the way down to custom CSS and entered this code.

site-title {
font-size: 28px;
float: left;
width: 73%;
}
.site-description {
color: #ffffff;
float: left;
}

but it’s not having any effect on my site. Am I doing something wrong? What are the necessary steps to move my image logo all the way to the left. Thanks in advance.