style.css

/* Resets */
/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
  display: block;
}
body {
  line-height: 1;
}
ol, ul {
  list-style: none;
}
blockquote, q {
  quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* General Styles */

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  width: 100%;
}

.flex {
  display: flex;
}

.flex-wrap {
  flex-wrap: wrap;
}

.jcc {
  justify-content: center;
}

.aic {
  align-items: center;
}

.tac {
  text-align: center;
}

a {
  text-decoration: none;
}

/* Custom Styles */

header {
  background-color: teal;
  padding: 2rem;
  color: #fff;
}

h1 {
  font-size: 2rem;
}

input {
  margin: 1rem auto;
  display: block;
  padding: 0.8rem;
  border-radius: 0.8rem;
  border: 1px solid gray;
}

input::placeholder {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

.display-images {
  margin-top: 2rem;
}

.display-images img {
  width: 300px;
  height: 300px;
  object-fit: cover;
  margin: 0.5rem;
  border-radius: 0.6rem;
}