* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 62.5%;
}

body {
  font-family: sans-serif;
  width: 90rem;
  margin: 0 auto;
}

.title {
  color: red;
  font-size: 3.2rem;
  text-align: center;
  margin: 3.2rem 0;
}

.instruction {
  font-size: 1.8rem;
  line-height: 1.4;
  padding-bottom: 1.6rem;
  margin-bottom: 1.6rem;
  border-bottom: black solid 1px;
}

.instruction ol {
  margin-left: 1.8rem;
}

.operation {
  font-size: 1.8rem;
  margin-bottom: 2.4rem;
  padding-bottom: 1.6rem;
  border-bottom: black solid 1px;

  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: 1.2rem;
  row-gap: 1.2rem;
  align-items: center;
  justify-items: center;
}

#zipFileInput {
  font-size: 1.8rem;
}

.btn {
  font-size: 1.8rem;
  font-weight: 700;
  background: greenyellow;
  border: orangered solid 3px;
  border-radius: 9px;
  padding: 0.8rem 1.6rem;
  cursor: pointer;
}

.btn:hover {
  box-shadow: 0 1rem 1rem rgba(0, 0, 0, 0.1);
}

.statistics {
  font-size: 2.4rem;
  margin-bottom: 2.4rem;
  padding-bottom: 1.6rem;
  border-bottom: black solid 1px;

  display: flex;
  align-items: center;
  justify-content: space-around;
}

.statistics.hidden {
  display: none;
}

.image-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  column-gap: 1.2rem;
  row-gap: 2.4rem;
  align-items: center;
  justify-items: center;
}

.thumbnail {
  border: 3px solid black;
  position: relative;
}

.thumbnail:hover {
  box-shadow: 0 0 3rem rgba(0, 0, 0, 0.2);
}

.thumbnail.deleted {
  border: 3px solid red;
  box-shadow: 0 0 2rem rgba(255, 0, 0, 0.3);
}

.thumbnail.deleted::after {
  content: "deleted";
  text-transform: uppercase;
  font-size: 3.2rem;
  color: red;
  background-color: rgba(255, 255, 255, 0.7);
  position: absolute;
  top: 50%;
  right: 50%;
  transform: translate(50%, -50%) rotate(45deg);
}

.thumbnail img {
  max-width: 20rem;
  max-height: 20rem;
  object-fit: cover;
}

.loading-msg {
  font-size: 2.4rem;
  padding: 1.6rem 3.2rem;
  margin: 0 auto;

  text-align: center;
  /* display: inline-block; */
  display: none;
  border: 2px solid blue;
}