.id-pdf-catalogue-section {
    position: relative;
    margin: 0;
    padding: 0;
    display: -webkit-box;
    display: -moz-box; 
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    flex-direction: row;
    flex-direction: row;
    flex-direction: row;
    flex-wrap: wrap;
    text-align: center;
}

.id-pdf-catalogue-item {
    margin: 0;
    width: 100%;
    box-sizing: border-box;
    position: relative;
    -webkit-flex: 1 0 100%;
    flex: 1 0 100%;
    padding: 30px;
    background-color: rgba(0,0,0,0.15);
}

.id-pdf-catalogue-item img {
    /*max-height: 250px;*/
    width: auto;
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
}

h4.id-pdf-catalogue-title {
    font-size: 1em;
/*    text-align: left;*/
    margin-top: 1em;
    padding-top: 1ex;
    border-top: 1px dashed rgba(255,255,255,.15);
}

@media screen and (min-width: 768px) {
h4.id-pdf-catalogue-title {
    text-align: left;
}
    .id-pdf-catalogue-item {
        /*margin-right: 30px;*/
        -webkit-flex: 1 0 33.333%;
        flex: 0 0 33.333%;        
    }    
}

@media screen and (min-width: 992px) {

    .id-pdf-catalogue-item {
        /*margin-right: 30px;*/
        -webkit-flex: 1 0 25%;
        flex: 0 0 25%;        
    }    
}

/* Curl Top Right */
.hvr-curl-top-right {
  display: inline-block;
  vertical-align: middle;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  box-shadow: 0 0 1px rgba(0, 0, 0, 0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}
.hvr-curl-top-right:before {
  pointer-events: none;
  position: absolute;
  content: '';
  height: 0;
  width: 0;
  top: 0;
  right: 0;
  background: white;
  /* IE9 */
  background: linear-gradient(225deg, #1c2c33 45%, #aaaaaa 50%, #cccccc 56%, white 80%);
  box-shadow: -1px 1px 1px rgba(0, 0, 0, 0.4);
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
  -webkit-transition-property: width, height;
  transition-property: width, height;
}
.hvr-curl-top-right:hover:before, .hvr-curl-top-right:focus:before, .hvr-curl-top-right:active:before {
  width: 25px;
  height: 25px;
  width: 35px;
  height: 35px;
}