Flexbox

The Flexbox implementation includes a lot more CSS to style it correctly. You can keep this CSS inside the formatting template or move it to your page's <head></head> tags of course.
<style>button[type=submit].ff-loading{display:inline-flex;flex-wrap:nowrap;align-items:center}button[type=submit].ff-loading:before{content:"";display:block;flex:1 0 11px;width:11px;height:11px;margin-right:10px;border-style:solid;border-width:2px;border-color:transparent transparent #fff #fff;border-radius:50%;animation:ff-loading .5s linear infinite}@keyframes ff-loading{0%{transform:rotate(0)}100%{transform:rotate(1turn)}}.freeform-pages{display:flex;padding:0;margin:0 0 10px;list-style:none}.freeform-pages li{margin:0 10px 0 0}.freeform-row{display:flex;justify-content:space-between;margin:0 -15px}.freeform-row .freeform-column{flex:1 0;padding:10px 0;margin:0 15px;box-sizing:border-box}.freeform-row .freeform-column>.freeform-row:first-child{margin-top:-10px}.freeform-row .freeform-column label{display:block}.freeform-row .freeform-column .input-group-one-line{display:flex;flex-wrap:wrap}.freeform-row .freeform-column .input-group-one-line label{padding-right:10px}.freeform-row .freeform-column .freeform-label{font-weight:bold}.freeform-row .freeform-column .freeform-label.freeform-required:after{content:"*";margin-left:5px;color:red}.freeform-row .freeform-column .freeform-input{width:100%;display:block;box-sizing:border-box}.freeform-row .freeform-column .freeform-input[type=checkbox],.freeform-row .freeform-column .freeform-input[type=radio]{width:auto;display:inline;margin-right:5px}.freeform-row .freeform-column .freeform-input.StripeElement{padding:4px 2px;border:1px solid #ccc;height:30px}.freeform-row .freeform-column .freeform-input-only-label{font-weight:normal}.freeform-row .freeform-column .freeform-input-only-label>.freeform-input{display:inline-block;width:auto;margin-right:5px}.freeform-row .freeform-column .freeform-errors,.freeform-row .freeform-column .ff-errors{list-style:none;padding:0;margin:5px 0 0}.freeform-row .freeform-column .freeform-errors>li,.freeform-row .freeform-column .ff-errors>li{color:red}.freeform-row .freeform-column .freeform-instructions{margin:0 0 5px;font-size:13px;color:#aba7a7}.freeform-row .freeform-column.freeform-column-content-align-left{display:flex;justify-content:flex-start}.freeform-row .freeform-column.freeform-column-content-align-left>button:not(:first-of-type){margin-left:5px}.freeform-row .freeform-column.freeform-column-content-align-center{display:flex;justify-content:center}.freeform-row .freeform-column.freeform-column-content-align-center>button:not(:first-of-type){margin-left:5px}.freeform-row .freeform-column.freeform-column-content-align-right{display:flex;justify-content:flex-end}.freeform-row .freeform-column.freeform-column-content-align-right>button:not(:first-of-type){margin-left:5px}.freeform-row .freeform-column.freeform-column-content-align-spread{display:flex;justify-content:space-between}.freeform-row .freeform-column.freeform-column-content-align-spread>button:not(:first-of-type){margin-left:5px}.ff-form-errors{padding:15px;border:1px solid #f5c6cb;background:#f8d7da;border-radius:5px;color:#721c24}.ff-form-errors>p{margin:0}.freeform-form-has-errors{color:#721c24}</style>

{{ form.renderTag }}

{% if form.pages|length > 1 %}
    <ul class="freeform-pages">
        {% for page in form.pages %}
            <li>
                {% if form.currentPage.index == page.index %}
                    <b>{{ page.label }}</b>
                {% else %}
                    {{ page.label }}
                {% endif %}
            </li>
        {% endfor %}
    </ul>
{% endif %}

{% if form.hasErrors %}
    <div class="freeform-form-has-errors">
        {{ "Error! Please review the form and try submitting again."|t('freeform') }}

        {% if form.errors|length %}
            <ul>
                {% for error in form.errors %}
                    <li>{{ error }}</li>
                {% endfor %}
            </ul>
        {% endif %}
    </div>
{% endif %}

{% for row in form %}
<div class="freeform-row {{ form.customAttributes.rowClass }}">
    {% for field in row %}
    {% set columnClass = "freeform-column " ~ form.customAttributes.columnClass %}
    {% if field.type == "submit" %}
        {% set columnClass = columnClass ~ " freeform-column-content-align-" ~ field.position %}
    {% endif %}
    <div class="{{ columnClass }}"{{ field.rulesHtmlData }}>
        {{ field.render({
            class: field.type not in ["submit", "signature"] ? "freeform-input" : "",
            labelClass: "freeform-label" ~ (field.inputOnly ? " freeform-input-only-label" : "") ~ (field.required ? " freeform-required" : ""),
            errorClass: "freeform-errors",
            instructionsClass: "freeform-instructions",
        }) }}

        {# FOR FREEFORM PAYMENTS #}
        {% if field.layoutRows is defined %}
            {% for layoutRow in field.layoutRows %}
                <div class="freeform-row {{ form.customAttributes.rowClass }}">
                    {% for layoutField in layoutRow %}
                        <div class="{{ columnClass }}">
                            {{ layoutField.render({
                                class: "freeform-input",
                                labelClass: "freeform-label" ~ (layoutField.inputOnly ? " freeform-input-only-label" : "") ~ (layoutField.required ? " freeform-required" : ""),
                                errorClass: "freeform-errors",
                                instructionsClass: "freeform-instructions",
                            }) }}
                        </div>
                    {% endfor %}
                </div>
            {% endfor %}
        {% endif %}

    </div>
    {% endfor %}
</div>
{% endfor %}

{{ form.renderClosingTag }}

<script>
  var form = document.querySelector('[data-id="{{ form.anchor }}"]');
  if (form) {
    form.addEventListener("freeform-stripe-styling", (event) => {
      event.detail.base = {
        fontSize: "16px",
        fontFamily: "-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,\"Helvetica Neue\",Arial,sans-serif,\"Apple Color Emoji\",\"Segoe UI Emoji\",\"Segoe UI Symbol\",\"Noto Color Emoji\"",
      }
    })
  }
</script>
​Flexbox

Flexbox
