Can you pls try this in the header area – text widget –
<div id="first-button" class="log-in_button">
<div class="button-wrap button_2" style="text-align:center;float:center;"><a class="button default small" href="http://targeturl.com" target="_blank">Log In</a></div></div>
<div id="second-button" class="button-wrap button_2" style="text-align:center;float:center;"><a class="button default small" background-color:#02baf2; border-color:#02baf2;" href="#" target="_self">Buy App</a></div>
And have this custom CSS in themeoptions –
#first-button {
right: 100px;
width: 100%;
position: absolute;
}
You can modify the custom CSS according to your requirement ..