mdi icon how to change size code example

Example 1: mdi icon size and color

<div class="input-group">
    <input type="text" class="form-control" placeholder="Search...">
    <span class="input-group-btn">
        <button class="btn btn-default" type="button" aria-label="Search">
            <i class="mdi mdi-magnify" aria-hidden="true"></i>
        </button>
    </span>
</div>

Example 2: mdi icon size and color

<ul class="nav nav-tabs">
    <li role="presentation" class="active">
        <a href="#">
            <i class="mdi mdi-home-modern" aria-hidden="true"></i>
            Home
            <span class="sr-only"> (current)</span>
        </a>
    </li>
    ...
</ul>