images - filterable gallery

            <div id="myBtnContainer">
                <button class="btn active" onclick="filterSelection('all')"> Show all</button>
                <button class="btn" onclick="filterSelection('holidays')"> Holidays</button>
                <button class="btn" onclick="filterSelection('cars')"> Cars</button>
                <button class="btn" onclick="filterSelection('people')"> People</button>
            </div>
            <!-- Portfolio Gallery Grid -->
            <div class="row">
                <div class="column holidays">
                    <div class="content">
                        <img src="../images/1.jpg" alt="lake" style="width:100%; height:100%;">
                        <h4>lake</h4>
                        <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
                <div class="column holidays">
                    <div class="content">
                        <img src="../images/2.jpg" alt="beach" style="width:100%; height:100%;">
                        <h4>beach</h4>
                        <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
                <div class="column holidays">
                    <div class="content">
                        <img src="../images/4.jpg" alt="bath" style="width:100%; height:100%;">
                        <h4>bath</h4>
                        <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
                <div class="column cars">
                    <div class="content">
                        <img src="../images/car1.jpg" alt="Car" style="width:100%; height:100%;">
                        <h4>Audi</h4>
                        <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
                <div class="column cars">
                    <div class="content">
                        <img src="../images/car3.jpg" alt="Car" style="width:100%; height:100%;">
                        <h4>Lamborghini</h4>
                        <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
                <div class="column cars">
                    <div class="content">
                        <img src="../images/car4.jpg" alt="Car" style="width:100%; height:100%;">
                        <h4>BMW</h4>
                        <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
                <div class="column people">
                    <div class="content">
                    <img src="../images/malcom-x.jpg" alt="malcom-x" style="width:100%; height:100%;">
                    <h4>Malcom-x</h4>
                    <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
                <div class="column people">
                    <div class="content">
                        <img src="../images/hemingway.jpg" alt="hemingway" style="width:100%; height:100%;">
                        <h4>Hemingway</h4>
                        <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
                <div class="column people">
                    <div class="content">
                        <img src="../images/tolkien.jpg" alt="tolkien" style="width:100%; height:100%;">
                        <h4>Tesla</h4>
                        <p>Lorem ipsum dolor..</p>
                    </div>
                </div>
            <!-- END GRID -->
            </div>
            <style>
                .row {box-sizing: border-box; display: flex; flex-flow: row wrap; margin: 1vw 0vw;}
                .row, .row > .column {padding: 1vw; }
                .column {float: left; width: 30%; height: auto; display: none; /* Hide all elements by default */}
                .row:after {content: ""; display: table; clear: both;} */
                .content {background-color: white; padding: 1vw;}
                /* The "show" class is added to the filtered elements */
                .show {display: block;}
                /* Style the buttons */
                .btn {border: none; outline: none; padding: 12px 16px; background-color: white; cursor: pointer;}
                .btn:hover { background-color: #ddd;}
                .btn.active {background-color: #666; color: white;}
        
            </style>
            <script>
                filterSelection("all")
                function filterSelection(c) {
                var x, i;
                x = document.getElementsByClassName("column");
                if (c == "all") c = "";
                for (i = 0; i < x.length; i++) {
                    w3RemoveClass(x[i], "show");
                    if (x[i].className.indexOf(c) > -1) w3AddClass(x[i], "show");
                }
                }
                
                function w3AddClass(element, name) {
                var i, arr1, arr2;
                arr1 = element.className.split(" ");
                arr2 = name.split(" ");
                for (i = 0; i < arr2.length; i++) {
                    if (arr1.indexOf(arr2[i]) == -1) {element.className += " " + arr2[i];}
                }
                }
                
                function w3RemoveClass(element, name) {
                var i, arr1, arr2;
                arr1 = element.className.split(" ");
                arr2 = name.split(" ");
                for (i = 0; i < arr2.length; i++) {
                    while (arr1.indexOf(arr2[i]) > -1) {
                    arr1.splice(arr1.indexOf(arr2[i]), 1);     
                    }
                }
                element.className = arr1.join(" ");
                }
                
                
                // Add active class to the current button (highlight it)
                var btnContainer = document.getElementById("myBtnContainer");
                var btns = btnContainer.getElementsByClassName("btn");
                for (var i = 0; i < btns.length; i++) {
                btns[i].addEventListener("click", function(){
                    var current = document.getElementsByClassName("active");
                    current[0].className = current[0].className.replace(" active", "");
                    this.className += " active";
                });
                }
            </script>
        

            <div class="containerA">
                <div>
                    <ul class="filter-menu">
                        <li data-target="all">All</li>
                        <li data-target="male">Male</li>
                        <li data-target="female">Female</li>
                        <li data-target="car">Car</li>
                    </ul>
                </div>
                <div>
                    <ul class="filter-items">
                        <li data-item="male"><img src="../images/einstein.jpg" alt=""/></li>
                        <li data-item="male"><img src="../images/tesla.jpg" alt=""/></li>
                        <li data-item="female"><img src="../images/4a.jpg" alt=""/></li>
                        <li data-item="female"><img src="../images/cartoon.jpg" alt=""/></li>
                        <li data-item="car"><img src="../images/car1.jpg" alt=""/></li>
                        <li data-item="car"><img src="../images/car2.jpg" alt=""/></li>
                    </ul> 
                </div>
            </div>
            <style>
                .containerA{display: inline-block; width: 90vw; margin: auto; padding: 15px; text-align: center;}
                .filter-menu{margin-bottom: 2vw;}
                .filter-menu li{ display: inline-block; padding: 1vw 2vw; background: #eb4d4b; color: #fff; cursor: pointer;}
                .filter-menu li:hover, .filter-menu li.current{ background: #ff7979;}
                ul{list-style: none;} 
                .filter-items img{max-width: 100%;height: auto;}
                .filter-items li{ width: 33%; padding: 0.1vw; float: left;}
                .filter-items li.active{width: 50%; padding: 2px; transition: all 0.5s ease;}
                .filter-items li.delete{width: 0%; padding: 0; transition: all 0.5s ease;}
                .filter-items img{display: block; width: 100%; height: 100%;} 
                @media screen and (min-width: 768px){
                    .filter-items li.active, .filter-items li{ width: 33.33%; }
                }
                @media screen and (min-width: 1280px){
                    .filter-item sli.active, .filter-items li{width: 25%;}
                }
            </style>
            <script>
                let sortBtn = document.querySelector('.filter-menu').children;
                let sortItem = document.querySelector('.filter-items').children;
                for(let i = 0; i < sortBtn.length; i++){
                    sortBtn[i].addEventListener('click', function(){
                        for(let j = 0; j< sortBtn.length; j++){
                            sortBtn[j].classList.remove('current');
                        }
                        this.classList.add('current');
                        let targetData = this.getAttribute('data-target');
                        for(let k = 0; k < sortItem.length; k++){
                            sortItem[k].classList.remove('active');
                            sortItem[k].classList.add('delete');
        
                            if(sortItem[k].getAttribute('data-item') == targetData || targetData == "all"){
                                sortItem[k].classList.remove('delete');
                                sortItem[k].classList.add('active');
                            }
                        }
                    });
                }
            </script>