.c-section__heading {
  margin-top: 40px; 
}

.p-sub-category {
  margin: 30px 10px;
  padding: 0;
  list-style-type: none;
}

.p-sub-category::after {
  display: block;
  clear: both;
  content: '';
}

.p-sub-category__item {
  float: left;  
  box-sizing: border-box;
  border: 1px solid #444;
  border-radius: 5px;
  margin: 0 7px 14px;
  padding: 7px 0;
  text-align: center;
  width: calc(50% - 14px);  
}

.p-sub-category__image {
  display: block;
  margin-bottom: 10px;
}

.p-sub-category__link {
  display: block;
  transition: opacity .2s;
  text-decoration: none;
  color: #444;
}

.p-sub-category__link:hover {
  opacity: .66;
}

.p-sub-category__link:active {
  opacity: 1;
}

.p-sub-category__name {
  line-height: 1.3;
  position: relative;
  display: block;
}

@media screen and (min-width: 600px) {
  
  .c-section__heading {
    margin-top: 100px; 
  }
  
  .p-sub-category {
    margin-right: 0;
    margin-left: 0;
  }

  .p-sub-category__item {
    margin: 0 7px 14px;
    padding: 7px 0;
    border: 1px solid #444;
    border-radius: 5px;
    text-align: center;
    width: calc(25% - 14px);
  }

  .p-sub-category__item:nth-child(4n + 1) {
    clear: both;
  }
}

@media screen and (max-width: 599px) {
  .p-sub-category__item:nth-child(2n + 1) {
    clear: both;
  }
}