How to Change site title Font Size and Colour of my Site Title and tagline in wordpress twenty twelve

in wordpress To Change site title Font Size and Colour of my Site Title and tagline in wordpress twenty  twelve theme,twenty twelve theme is a free theme and it has simple to install and modify(child theme) your Feature Requirements.
To Change header font-size and color to follow the Steps.
how to change twenty twelve theme site title color

In this section /* Header */

Before

.site-header h1 a,
.site-header h2 a {
color:#515151;
display: inline-block;
text-decoration: none;
}

After Change

.site-header h1 a,
.site-header h2 a {
color:#3399ff;
display: inline-block;
text-decoration: none;
}

How to change the  site title font Size and colour of the  Title and tagline of my site.

How to change WordPress Twenty twelve theme tagline color

Before:

.site-header h2 {
font-weight: normal;
font-size: 13px;
font-size: 0.928571429rem;
line-height: 1.846153846;
color:#757575;
}

After Changes

.site-header h2 {
font-weight: normal;
font-size: 13px;
font-size: 0.928571429rem;
line-height: 1.846153846;
color:#FF0066;
}

How do I Increase Header Title font size in wordpress twenty twelve

To Change wordpress title font size

Before

.site-header h1 {
font-size: 26px;
font-size: 1.857142857rem;
line-height: 1.846153846;
margin-bottom: 0;
}

After Changes

.site-header h1 {
font-size: 26px;
font-size: 2.857142857rem;
line-height: 1.846153846;
margin-bottom: 0;
}

How to change the font Size and colour of the  Title and tagline of my site