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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Row double 50% height with gap</title>


    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" />
    <style>
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html,
        body {
            height: 100%;
        }

        .container-fluid {
            width: 80% !important;
            margin: 200px auto;
            background-color: green;
            height: 500px;
        }

        .row-double {
            height: 100%;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .row-double>.row {
            flex: 1;
            margin: 0;
        }

        .row-double img {
            aspect-ratio: 1 / 1;
        }

        figure {
            margin-bottom: 0 !important;
        }

        img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            aspect-ratio: 16 / 9;
        }

        .gap-15 {
            gap: 15px;
            padding: 0 !important;
            margin: 0 !important;
        }

        .gap-15>* {
            padding: 0 !important;
            max-width: calc(50% - 15px *1/2);
        }
    </style>
</head>

<body>
    <section class="mosaic mosaic-02 container-fluid fade-slide fade-slide-down px-0">
        <div class="row h-100 gap-15">
            <div class="col-6">
                <figure id="main" class="h-100 m-0">
                    <img src="https://picsum.photos/1200/800" alt="Placeholder" />
                </figure>
            </div>
            <div class="row col-6 gap-15">
                <figure class="col-6">
                    <img src="https://picsum.photos/1500/800" alt="Placeholder" />
                </figure>
                <figure class="col-6">
                    <img src="https://picsum.photos/1200/850" alt="Placeholder" />
                </figure>
                <figure class="col-6">
                    <img src="https://picsum.photos/800/800" alt="Placeholder" />
                </figure>
                <figure class="col-6">
                    <img src="https://picsum.photos/1200/900" alt="Placeholder" />
                </figure>
            </div>
        </div>
    </section>
</body>

</html>
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