Как выровнить отступы между картинок чтобы они встали ровно при display: flex;?

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    <div class="section__photo">
    <div class="section__photo-gallery">
    <img class="photo__gallery" src="image/photo__bg-1.jpg"  alt="" >
  <div class="section__content"></div>
  </div>



  <div class="section__photo-gallery">
    <img class="photo__gallery" src="image/photo__bg-2.jpg" alt="" >
    <div class="section__content"></div>
  </div>


  <div class="section__photo-gallery">
    <img class="photo__gallery" src="image/photo__bg-3.jpg"  alt="" >
    <div class="section__content"></div>
  </div>



  <div class="section__photo-gallery">
     <img class="photo__gallery" src="image/photo__bg-4.jpg"  alt="" >
     <div class="section__content"></div>
  </div>
    


  <div class="section__photo-gallery">
     <img class="photo__gallery" src="image/photo__bg-5.jpg" alt="" >
     <div class="section__content"></div>
    </div>


   
    <div class="section__photo-gallery">
    <img class="photo__gallery" src="image/photo__bg-6.jpg" alt="" >
      <div class="section__content"></div>
  </div>
  </div>

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  .section__photo {
display: flex;
flex-wrap: wrap; 
    padding-bottom: 73px;
width: 1280px;
flex-direction: column;
flex-direction: row;
}
  


.section__photo-gallery{
padding-bottom: 20px;
padding-right: 20px;
  position: relative;


}


.section__photo-gallery:last-child(3n - 1){
margin-right: 0;


}







.section__content{
background: rgba(0,0,0,0.50);
position: absolute;
width: 100%;
height: 100%;
left: 0;
top: 0;
opacity: 0;



}


.section__content:hover{
  background: rgba(0,0,0,0.50);
opacity: 1;
}