index.css

@import url('https://fonts.googleapis.com/css?family=Fredoka+One|Slackey');
/* GENERAL LAYOUT STYLE */

body {
  text-align: center;
  background-color: #777d81;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Cg fill='%2363cdda' fill-opacity='0.4'%3E%3Cpath fill-rule='evenodd' d='M11 0l5 20H6l5-20zm42 31a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM0 72h40v4H0v-4zm0-8h31v4H0v-4zm20-16h20v4H20v-4zM0 56h40v4H0v-4zm63-25a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm10 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM53 41a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm10 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm10 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-30 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm-28-8a5 5 0 0 0-10 0h10zm10 0a5 5 0 0 1-10 0h10zM56 5a5 5 0 0 0-10 0h10zm10 0a5 5 0 0 1-10 0h10zm-3 46a3 3 0 1 0 0-6 3 3 0 0 0 0 6zm10 0a3 3 0 1 0 0-6 3 3 0 0 0 0 6zM21 0l5 20H16l5-20zm43 64v-4h-4v4h-4v4h4v4h4v-4h4v-4h-4zM36 13h4v4h-4v-4zm4 4h4v4h-4v-4zm-4 4h4v4h-4v-4zm8-8h4v4h-4v-4z'/%3E%3C/g%3E%3C/svg%3E");
  padding: 0;
  margin: 0;
}

/* Overrides Browser Defaults */
p, h3, a, ul {
  font-family: 'Fredoka One', sans-serif;
  text-decoration: none;
  color: #524b3f;
  margin-block-start: 0em;
  margin-block-end: 0em;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
}

.header {
  position: relative;
  top: -10px;
  background: rgba(99, 205, 218, .5);
  padding: 2em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.89)
}

.header h1, h2 {
  margin: 10px;
  font-family: 'Slackey', cursive;
}

.header h1 {
  font-size: 8vw;
}

h2 {
  font-size: 3.5vw;
  color: #444444;
  font-family: 'Fredoka One', cursive;
}

/* Flex Card Container */
.flex {
  display: flex;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -moz-flex;
  display: -webkit-flex;
  -ms-box-orient: horizontal;
  justify-content: center;
  padding: 0;
  margin: 0;
  list-style: none;
  line-height: 0;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
}

.flex li {
  background: rgba(99, 205, 218, .5);
  border-radius: 10px;
  border: 1.5px solid #ffffffa2;
  margin-top: 20px;
}

.flex li:hover {
  -webkit-box-shadow: 10px 10px 36px 0px rgba(0, 0, 0, 0.75);
  -moz-box-shadow: 10px 10px 36px 0px rgba(0, 0, 0, 0.75);
  box-shadow: 10px 10px 36px 0px rgba(0, 0, 0, 0.75);
}

.card {
  width: calc(100% * (1/2));
  margin: 20px 10px;
  transition-duration: .5s;
}
.card:hover {
  transform: scale(1.02);
}

.art-image {
  width: 27vw;
  height: 27vw;
  vertical-align: middle;
  border-radius: 10%;
  border: 3.5px solid #ffffffa2;
  padding: 5px;
  background: #948b7a;
  object-fit: cover;
  margin-top: 20px /*Extra */
}

.flex-content {
  display: block;
  margin-top: 15px;
}

.art-title {
  font-size: 5vw;
  padding: 10px;
  line-height: 3vw;
  color: rgb(50, 51, 51);
  margin-top: 0px;
}

.art-title:hover {
  color: rgb(240, 240, 240);
}

.author {
  font-size: 1.2em;
  color: #524b3f;
  text-transform: capitalize;
  padding: 7px 10px 15px 10px;
  line-height: 15px
}

.author>a:hover {
  color: rgb(255, 255, 255)
}

#footer {
  padding: 35px 20px;
  background-color: #343a40b0;
  justify-content: center;
  color: rgb(153, 153, 153);
  font-size: 1.1rem;
  font-family: 'Open Sans', sans-serif;
  border-top: 1px solid rgba(255, 255, 255, 0.89)
}

/* ============================================= */
/*              Responsive Browsong              */
/* ============================================= */

@media only screen and (min-width: 600px) {
.card {
  width: calc(100% * (1/3));
}

.card img {
  top: -45px;
  width: 10vw;
  height: 10vw;
}

.art-title {
  font-size: 3.0vw;
  padding-top: 25px;
}
.author a {
  font-size: 2.1vw
}
}

@media only screen and (min-width: 900px) {
  .header h1 {
    font-size: 6vw;
  }

  h2 {
    font-size: 2vw;
  }

  .card {
    width: 25%;
  }

  .card img {
    top: -65px;
    width: 10vw;
    height: 10vw;
  }

  .art-title {
    font-size: 2.3vw;
    padding-top: 8px;
  }
  .author a {
    font-size: 1.6vw
  }
}