Example : Custom style

Logic

Style your autocomplete.

CSS Code:

customization.css

/*Desktop*/
@media screen and (min-width: 770px){
  div[id*=fast-autocomplete] .info.fs-product-info {
    text-align: center;
    font: normal normal 300 10px/13px Euclid;
    letter-spacing: 1px;
    color: #717171;
    text-transform: uppercase;
  }
  div[id*=fast-autocomplete] .info.fs-product-info .vendor{
    color: #2E2E2E;
  }
  div[id*=fast-autocomplete].fast-simon-autocomplete .fs-product {
    border-bottom: none;
  }
  div[id*=fast-autocomplete].fast-simon-autocomplete .fs-product:hover {
    background: transparent ;
  }
  .fast-simon-autocomplete.wide .fs-product .fs-product-image {
      max-height: unset;
  }
  div[id*=fast-autocomplete] .line-item:hover {
    background-color: transparent ;
    text-decoration: underline ;
  }
  div[id*=fast-autocomplete] .fast-ac-item.line-item a{
    text-align: left ;
    font: normal normal normal 11px/35px Euclid ;
    letter-spacing: 1.1px ;
    color: #2E2E2E ;
    text-transform: uppercase ;
  }
  div[id*=fast-autocomplete] header.fs-autocomplete-header svg{
    display: none ;
  }
  div[id*=fast-autocomplete] header.fs-autocomplete-header span{
    text-align: left;
    font-size: 12px;
    line-height: 14px;
    letter-spacing: 1.2px;
    color: #969696;
    text-transform: uppercase;
    font-family: 'quiche-text';
  }
  div[id*=fast-autocomplete] .price.fs-product-price-wrapper{
    display: none !important;
  }
  div[id*=fast-autocomplete] .autocomplete-inner {
    margin-top: 50px;
  }
  div[id*=fast-autocomplete] .autocomplete-inner .wide{
    grid-template-columns: unset;
    row-gap: 5%;
  }
  div[id*=fast-autocomplete] .autocomplete-inner .wide .fast-wide-items{
    display: grid;
    grid-template-columns: 30% 30%;
    grid-column-gap: 20%;
  }
  div[id*=fast-autocomplete] .autocomplete-inner .wide .fast-wide-items .children.single-line{
    grid-template-columns: 1fr 1fr 1fr;
  }

  div[id*=fast-autocomplete] .summery {
    background: transparent;
    top: 0;
    position: absolute;
    padding: 25px 33px;
    text-transform: uppercase;
    text-decoration: underline;
  }
  div[id*=fast-autocomplete] .autocomplete-inner .fs-autocomplete-header{
    border-bottom-width: 0px;
  }

}
/*Mobile*/
@media screen and (max-width: 769px){
  div[id*=fast-autocomplete]  .autocomplete-inner {
    order: 3;
    max-height: 60vh !important;/*calc(100vh - 150px - var(--announcement-bar-height) - var(--header-height) ) !important;*/
  }
  div[id*=fast-autocomplete] a.fast-ac-item.fs-product.item {
    grid-template-columns: none;
  }
  div[id*=fast-autocomplete] .children.single-line {
    grid-template-columns: 1fr 1fr 1fr;
  }
  div[id*=fast-autocomplete] .line-item.bubble{
    background-color: transparent ;
    font: normal normal normal 11px/18px Euclid;
    letter-spacing: 1.1px;
    color: #2E2E2E;
    text-transform: uppercase;
  }
  div[id*=fast-autocomplete] .image.fs-product-image {
    max-height: unset ;
  }
  div[id*=fast-autocomplete] .info.fs-product-info {
    text-align: center;
    font: normal normal normal 11px/14px Euclid;
    letter-spacing: 1.1px;
    color: #2E2E2E ;
    text-transform: uppercase;
    opacity: 1;
  }
  div[id*=fast-autocomplete] header.fs-autocomplete-header {
    text-align: left;
    letter-spacing: 1.2px;
    color: #969696;
    text-transform: uppercase;
    opacity: 1;
    font-family: 'quiche-text';
    font-style: normal;
    font-weight: normal;
    font-size: medium;
    border-bottom: 0 ;
    font-size: 12px;
    line-height: 15px;
    margin-top: 30px;
  }
  div[id*=fast-autocomplete] .price.fs-product-price-wrapper,
  div[id*=fast-autocomplete] header.fs-autocomplete-header svg {
    display: none ;
  }
  div[id*=fast-autocomplete] .info.fs-product-info .vendor.fs-product-vendor{
    display: block ;
  }
  div[id*=fast-autocomplete] .info.fs-product-info span.fs-product-title {
    text-align: center;
    font: normal normal 300 10px/13px Euclid;
    letter-spacing: 1px;
    color: #717171;
    text-transform: uppercase;
    opacity: 1;
  }
  div[id*=fast-autocomplete] .info.fs-product-info .vendor.fs-product-vendor .label{
   -webkit-line-clamp: 1 ;
  }
  div[id*=fast-autocomplete] .info.fs-product-info .title.fs-product-title .label{
   -webkit-line-clamp: 2 ;
  }
  div[id*=fast-autocomplete] .summery {
      text-transform: uppercase ;
      text-align: left;
      font-size: 12px;
      line-height: 15px;
      font-family: 'Euclid' ;
      letter-spacing: 1.2px;
      color: #2C2C2C;
      background: #fff;
      text-decoration: underline;
      order: 2;
      padding: 25px 15px 0 15px;
  }
  div[id*=fast-autocomplete] {
    display: inline-grid;
  }
  div[id*=fast-autocomplete] .triangle.fs-triangle{
    order: 1;
  }
  div[id*=fast-autocomplete] .fast-ac-item.line-item{
        margin: 5px 0px ;
  }
}

div[id*=fast-autocomplete] .info.fs-product-info .vendor.fs-product-vendor{
  display: block ;
}

Result