index.css

body {
  font: 1.2em;
  font-family: Open Sans sans-serif;
  max-width: 43em;
  margin: auto;
  background-image: linear-gradient(black, black, white, black, black);
  background-attachment: fixed;
}

#banner {
  position: static;
  border-width: 0 1px 1px 1px;
  border-color: white;
  border-style: solid;
  top: 0px;
  left: 0px;
  width: 50vw;
  margin: 0 auto;
  text-align: center;
}

#banner_contents {
  width: 80px;
}

img {
  display: block;
  margin: auto;
  max-width: 20em;
  border: 1px solid #777;
}
img:hover {
  border: 1px solid gray;
}
.m_box {
  border: 1px solid gray;
  margin: 1em;
  background-color: white;
}
.m_box_red {
  border: 1px solid gray;
  margin: 1em;
  background-color: white;
  text-align: center;
}

a {
  color: gray;
  text-decoration: underline;
}
.m_box_bar {
  background: gray;
  color: white;
}
.m_box_bar_red {
  background: gray;
  color: white;
}

h2.m_box {
  background-color: gray;
}
h2.box {
  background-color: gray;
}
p {
  margin: 0.5em;
  margin-left: 1em;
  color: black;
}

.box {
  border: 1px solid gray;
  color: gray;
  margin: 1em;
  background-color: white;
}
.box_bar {
  background: gray;
  color: white;
}

h2 {
  margin-top: 0.001em;
  margin-bottom: 0.001em;
  margin-left: 0.25em;
  font-size: 1.1em;
  text-align: center;
}
h3 {
  margin-left: 0.3em;
  font-size: 1em;
  margin-top: 0.3em;
  margin-bottom: 0.1em;
  text-decoration: underline;
  text-align: center;
  font-weight: bold;
}
li {
  margin-left: 0.3em;
}
ul {
  list-style-type: circle;
}
a:hover {
  color: gray;
  text-decoration: underline;
}

.column {
  float: left;
  width: 32%;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

.gallery_container {
  display: grid;
  justify-items: auto;
  grid-template-columns: 33.33% 33.33% 33.33%;
  padding: 0.5em;
  width: auto;
}

div.gallery_item {
  object-fit: cover;
}

.gallery_item img {
  border: 1px solid #777;
  height: auto;
  width: auto;
  max-width: 80%;
  max-height: 80%;
  object-fit: cover;
}

div.desc {
  padding: 1em;
  text-align: center;
  font-size: smaller;
  width: 80%;
  max-height: 100%;
}

@media only screen and (max-width: 600px) {
  img {
    width: 100%;
  }

  body {
    width: 100%;
  }

  div.desc {
    font-size: x-small;
  }

  ul {
    margin-right: 1em;
  }
}