Как вывести карточки в три столбца?

Question

eridanlivia @eridanlivia

CSS

Как вывести карточки в три столбца?

Здравствуйте. Имеется код:

let userProf = '<ul style="list-style-type: none">';
    for (let i = 0; i < DATA.length; i++) {
        userProf += "<div class=\"textcols-item show-modal\">" + "<div class=\"trigger\">" + "<h3>" + DATA[i].name + "</h3>" +
            "<br>" + "<br>" +
            "<i class=\"icono-iphone\"></i>" + "&nbsp" + "&nbsp" + "<span>" + DATA[i].phone + "</span>" +
            "<br>" + "<br>" +
            "<i class=\"icono-mail\"></i>" + "&nbsp" + "&nbsp" + "<span>" + DATA[i].email + "</span>" + "</div>" + "</div>" + "&nbsp"

        ;
    }
    document.getElementById("result").innerHTML = userProf;

    document.getElementById('search').onkeyup = function() {
        document.getElementById('result').innerHTML = '';
        let searchText = this.value.toLowerCase();
        let stringLength = searchText.length;
        if (stringLength > 1) {
            for (let i = 0; i < DATA.length; i++) {
                let userName = DATA[i].name.split('').slice(0, stringLength).join('').toLowerCase();
                let userPhone = DATA[i].phone.split('').slice(0, stringLength).join('').toLowerCase();
                let userEmail = DATA[i].email.split('').slice(0, stringLength).join('').toLowerCase();
                if (userName == searchText || userEmail == searchText) {
                    document.getElementById('result').innerHTML += "<ul style=\"list-style-type: none\">" + "<div class=\"trigger\">" + "<li class='list'>" + "<h3>" + DATA[i].name + "</h3>" +
                        "<br>" + "<br>" +
                        "<i class=\"icono-iphone\"></i>" + "&nbsp" + "&nbsp" + "<span>" + DATA[i].phone + "</span>" +
                        "<br>" + "<br>" +
                        "<i class=\"icono-mail\"></i>" + "&nbsp" + "&nbsp" + "<span>" + DATA[i].email + "</span>" + "</li>" + "</div>" + "</div>" + "</ul>" + "<br>" + "<br>";
                }
            }
        } else {
            document.getElementById("result").innerHTML = userProf;
        }
    };

На страницу вывод поиск и карточки, но карточки в один столбец. Как сделать, чтобы они были по центру в три столбца? Спасибо!

css:

.trigger {
    color: black;
    padding: 12px 8px;
    font-size: 17px;
    font-weight: bold;
    cursor: pointer;
    width: 340px;
    height: 350px;
    border-radius: 25px;
    border: 2px solid #fdfdfd;
    box-shadow: 0px 0px 11px 1px rgba(82, 80, 80, 0.78), 0px 0px 4px 1px rgba(27, 25, 25, 0.66);
}
.modal {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 70%;

    background-color: white;
    padding: 6rem;
    border-radius: 5px;
    box-shadow: 0 3rem 5rem rgba(0, 0, 0, 0.3);
    z-index: 10;
}
.close-modal {
    position: absolute;
    top: 1.2rem;
    right: 2rem;
    font-size: 5rem;
    color: #333;
    cursor: pointer;
    border: none;
    background: none;
}
.hidden {
    display: none;
}





.textcols {
    white-space: nowrap;
}
.textcols-item {
    white-space: normal;
    width: 33.333%;
    vertical-align: top;
    justify-content: center;
    max-width: 100px;
    border-width: 5px;
}
.textcols .textcols-item:first-child {
    margin-right: 100%;
}



.name {
    font-weight: 900;
}


.main {
    width: 100%;
    margin: 0;

}



::selection {
    color: #fff;
    background: #664AFF
}

.wrapper {
    max-width: 1000px;
    margin: 15px auto;
}

.wrapper .search-input{
    background: #fff;
    width: 100%;
    border-radius : 25px;
    position: relative;
    box-shadow: Opx 1px 5px 3px rgba(0,0,0,0. 12);
}

.search-input input {
    height: 55px;
    width: 100%;
    outline: none;
    border: none;
    border-radius: 500px;
    padding: 0 60px 0 20px;
    font-size: 18px;
    box-shadoW: 0px 1px 5px rgba(0,0,0,0.1);
    z-index: 1;
    position: relative;
}

.search-input.active input{
    border-radius : 5px 5px 0 0;
}

.search-input .autocom-box{
    padding: 0;
    opacity: 0;
    pointer-events: none;
    max-height: 500px;
    overflow-y: auto;
    background-color: #ffffff;
    border-radius : 0 0 5px 5px;
    position: absolute;
    width: 100%;
}

.search-input.active .autocom-box{
    padding: 10px 8px;
    opacity: 1;
    pointer-events: auto ;
}

.autocom-box li {
    list-style: none;
    padding: 8px 12px;
    display: none;
    width: 100%;
    cursor: default;
    border-radius: 3px;
}

.search-input.active .autocom-box li{
    display: block;
}

.autocom-box li:hover{
    background: #efefef;
}

.search-input .icon{
    position: absolute;
    right: 0px;
    top: 0px;
    height: 55px;
    width: 55px;
    text-align: center;
    line-height: 55px;
    font-size: 20px;
    color: #0d6efd;
    cursor: pointer;
    z-index: 2;
}