* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial;
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header, footer {
    background-color: lightpink;
    text-align: center;
    padding: 20px;
}

.main {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px;
    flex: 1;
}

.box {
    border: 2px solid pink;
    background-color: #fff0f5;
    padding: 10px;
    flex-basis: 100%;
}

img {
    width: 100%;
    height: auto;
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    height: 0;
}

.video-container iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
}

@media only screen and (min-width: 600px) and (max-width: 899px) {

    .box {
        flex-basis: 48%;
    }

    .video {
        order: -1;
    }
}

@media only screen and (min-width: 900px) {

    .box {
        flex-basis: 30%;
    }

    .video {
        order: 0;    
    }
}