.container {
  width: 100%;
  padding-right: 15px;
  padding-left: 15px;
  margin-right: auto;
  margin-left: auto;
}

@media (min-width: 576px) {
  .container {
    max-width: 540px;	
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 720px;
  }
}

@media (min-width: 992px) {
  .container {
    max-width: 960px;
  }
}

@media (min-width: 1200px) {
  .container {
    max-width: 1540px;
  }
}

.card-img-top {
    border-radius: 0px;
}

@media (max-width: 768px) { 
    .card-columns {
        column-count: 2; 
    }
}
@media (min-width: 768px) and (max-width: 992px) { 
    .card-columns {
            column-count: 3; 
    } 
}
@media (min-width: 992px) { 
    .card-columns {
        column-count: 4; 
    } 
}