Set Padding on Minimum Width [Aura]

I’d like to add SLDS padding for a minimum width value of an input field. Have the padding set in my code, I just need it to only display when the width of the screen is larger than 760px

.cmp

    <div class="minimumWidth">
      <lightning:input class=" slds-size_1-of-1 slds-medium-size--1-of-2 slds-large-size--1-of-2 "
       name="field1" label="field1" required="true" aura:id="field1" />
   </div>

.css

.THIS .minimumWidth .slds-p-left_medium{min-width:760px;}

<div class="minimumWidth slds-p-around_x-small">
      <lightning:input class=" slds-size_1-of-1 slds-medium-size--1-of-2 slds-large-size--1-of-2 "
       name="field1" label="field1" required="true" aura:id="field1" />
   </div>