style.css

* {
    margin: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

html,
body {
    width: 100%;
}

header {
    width: 100%;
    display: flex;
    justify-content: center;

}

#search-form {
    display: flex;
    justify-content: center;
    width: 33%;
}

#search-bar {
    width: 100%;
    height: 30px;
    background-color: #f1f1f1;
    color: grey;
    margin: 15px 0;
    text-align: left;
    border-radius: 2px;
    border: .5px solid black;
}

#search-title {
    text-align: center;
}

#photo-div {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    height: 1500vh;
    margin: 10px;
}

#photo-div>section {
    margin: 10px;
    max-width: 30%;
}

.thumbnail-pics {
    max-width: 100%;
    border-radius: 1px;
}