Using custom mixins in .scss file

Home.module.scss

@import '../theme/theme';
@import '../mixins/width';
@import '../mixins/height';

.parent {
  height: 100%;
  width: 100vw;
  color: $bg-d;
  display: flex;
  flex-direction: column;
  align-items: center;
  .header {
    width: 60%;
    margin: 3.22rem 0 0 0;
    @include respond-below-width(sm) {
      width: 80%;
    }
    @include respond-below-height(lg) {
      margin: 2rem 0 0.5rem 0;
      @include respond-below-height(md) {
        margin: 1rem 0 0.6rem 0;
        @include respond-below-height(sm) {
          margin: 0.66rem 0 2rem 0;
        }
      }
    }
    .title {
      font-weight: bold;
      color: $bg-df-900;
      margin-bottom: 0;
      padding-bottom: 0.3rem;
      font-size: 3.5rem;
      letter-spacing: 0.1rem;
      border-bottom: calc(0.2px + 0.05rem) solid #e5e5e5;
      #span {
        color: $secondary;
      }
    }
    .subtitle {
      text-align: justify;
      font-size: 1.67rem;
      margin: 0.22rem 0 0.22rem 0;
      color: $bg-d;
    }
  }
  .subheader {
    font-size: 1.77rem;
    margin-bottom: 1rem;
    align-items: center;
    justify-content: center;
    .secondary {
      text-align: center;
      color: $secondary;
      font-weight: bold;
      margin-bottom: 0.76rem;
      padding: 0;
      .span {
        font-weight: 400;
        color: $bg-d;
        margin: 0;
        padding: 0;
      }
    }
  }
  .grid {
    width: 70%;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    @include respond-below-width(sm) {
      width: 100%;
    }
    @include respond-above-height(lg) {
      height: 400px;
    }
    @include respond-below-height(lg) {
      height: 300px;
      @include respond-below-height(md) {
        margin-top: 1rem;
        @include respond-below-height(sm) {
          margin-top: 1.5rem;
          height: 120px;
          @include respond-below-height(xs) {
            margin-top: 2.5rem;
            height: 100px;
          }  
        }  
      }
    }
    #col {
      display: flex;
      flex-direction: column;
      flex: 1;
      align-items: center;
      justify-content: space-between;
      margin: 0.77rem;
      padding: 1.5rem 0 0 0;
      border-radius: 0.75rem;
      background-color: $bg-d;
      box-shadow: rgba(50, 50, 93, 0.25) 5px 7px 9px -5px,
      rgba(72, 72, 72, 0.3) 4px 8px 4px -6px;
      transition: all 300ms;
      .columnIcon {
        color: $white;
        font-size: 2.5rem;
      }
      .cta {
        width: 100%;
        height: 30px;
        text-align: center;
        padding: 0.77rem 0 1rem 0;
        color: $text-light;
        border-top: 1px solid $light;
        line-height: 1.3;
      }
    }
    #col:hover {
      cursor: pointer;
      border: 1px solid $secondary;
      background-color: $bg-df-900;
      .columnIcon {
        color: $secondary;
      }
      .cta {
        border-top: 1px solid $secondary;
        color: $white;
      }
    }
  }
}