If you are using a Donation Detail Page, it should be mobile friendly. You can copy/paste the HTML below into the Detail Page content editor and then make adjustments to the items you want/need.
<div class="imod_donationDetails">
<h2 class="imod_eventName">[[Campaign Name]]</h2>
<div class="imod_donationBtn">[[Campaign Donate Button]]</div>
<div class="imod_eventDescription">[[Campaign Description]]</div>
<div class="imod_eventContact">
<h3 class="imod_eventLabel">Contact Information</h3>
<div class="imod_eventContactPrimary">
<h4>Primary Contact</h4>
<div>[[Contact1 First Name]] [[Contact1 Last Name]]</div>
<div>[[Contact1 Title]]</div>
<div>[[Contact1 Street1]]</div>
<div>[[Contact1 Street2]]</div>
<div>[[Contact1 City]]<span id="contactseparator1">, </span>[[Contact1 State]]
[[Contact1 Postal Code]]</div>
<div>[[Contact1 Phone]]</div>
<div>[[Contact1 Fax]]</div>
<div>[[Contact1 Email]]</div>
</div>
<div class="imod_eventContactSecondary">
<h4>Secondary Contact</h4>
<div>[[Contact2 First Name]] [[Contact2 Last Name]]</div>
<div>[[Contact2 Title]]</div>
<div>[[Contact2 Street1]]</div>
<div>[[Contact2 Street2]]</div>
<div>[[Contact2 City]]<span id="contactseparator2">, </span>[[Contact2 State]]
[[Contact2 Postal Code]]</div>
<div>[[Contact2 Phone]]</div>
<div>[[Contact2 Fax]]</div>
<div>[[Contact2 Email]]</div>
</div>
</div>
</div>
<div style="clear: both;" originalstyle="clear: both;"></div>