style.css

@import url('https://fonts.googleapis.com/css2?family=Lato:wght@100;300;400;700&display=swap');

body {
    font-family: 'Lato', sans-serif;
    margin: 0;
    text-align: center;
    min-width: 480px;
    background-color: #2b2d42;
    color: #f4f1de;
    min-height: calc(100vh - 25px);
}

h2 {
    font-weight: 300;
}

button {
    background-color:#646899;
    color: white;
    font-size: 1.2rem;
    margin-bottom: 130px;
    padding: 15px 30px;
    border-radius: 5px;
    border: solid 1px yellow;
    box-sizing: content-box;
}

button:hover {
    background-color: #4c4f74;
    padding: 13px 30px;
    border: solid 3px yellowgreen;
    box-sizing: content-box;
    transition: ease-in-out 0.2s;
}

button:active {
    background-color: #646899;
    padding: 13px 32px;
    border: inset 3px yellow;
}

#dogImages {
    margin: auto 100px;
    padding: 30px;
}

.imgContainer {
    background-color: rgb(248, 245, 234);
    width: 340px;
    height: 340px;
    border-radius: 3px;
    display: inline-block;
    justify-content: flex-start;
    margin: 20px 20px;
    vertical-align: top;
}

img {
    max-width: 300px;
    max-height: 300px;
    padding: 20px;
    vertical-align: top;
}

video {
    margin: auto;
    padding: 30px;
}

footer {
    position: fixed;
    background-color: #4c4f74;
    bottom: 0;
    /* margin-bottom: 0; */
    width: 100%;
}

footer a {
    color: yellowgreen;
    text-decoration: none;
    font-weight: 400;
}

footer a:hover {
    color: yellow;
    transition: 1s;
}


@media only screen and (max-width: 600px) {
    body {
        min-width: 375px;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.2rem;
    }

    #dogImages {
        margin: auto;
        padding: auto;
    }
    
    .imgContainer {
        margin: auto;
        margin-bottom: 20px;
        width: 300px;
        height: 320px;
        display: inline-block;
        justify-content: center;
    }

    img {
        max-width: 260px;
        max-height: 280px;
        padding: 20px;
        vertical-align: super;
    }

    video {
        max-width: 300px;
        max-height: 280px;
        padding: 20px;
    }

    button {
        margin-bottom: 120px;
    }

    footer {
        max-height: 80px;
    }
}