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

body {
  background: #f1f1f1;
  font-family: 'Roboto', sans-serif;
}

.screen {
  display: none;
}
.screen.active {
  display: block;
}
.app {
  position: fixed;
  top: 0px;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 100%;
  max-width: 500px;
  background: #fff;
  border-right: 1px solid #ddd;
  border-left: 1px solid #ddd;
}

.join-screen .form {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  padding: 50px;
}

.join-screen .form .form-input {
  margin: 10px 0px;
}
.join-screen .form h2 {
  font-size: 40px;
  line-height: 45px;
  color: #222;
  margin-bottom: 20px;
}
.join-screen .form button {
  background: #111;
  padding: 10px 20px;
  font-size: 18px;
  border-radius: 20px;
  color: #fff;
  border: none;
  outline: none;
  cursor: pointer;
}
.join-screen .form #join-id b {
  color: #222;
  display: block;
  margin-top: 20px;
}
.join-screen .form #join-id span {
  display: inline-block;
  font-size: 25px;
  font-family: monospace;
  color: #222;
  padding: 10px;
  border: 1px solid #111;
  margin-top: 5px;
}

.join-screen .form label {
  color: #222;
  font-size: 18px;
}
.join-screen .form input {
  display: block;
  margin: 10px 0;
  width: 100%;
  max-width: 200px;
  border: 1px solid #111;
  color: #111;
  font-size: 20px;
  padding: 10px;
}

.fs-screen {
  padding: 20px
}
.fs-screen .file-input {
  width: 100%;
  border: 2px dashed #555;
}
.fs-screen .file-input label {
  display: block;
  width: 100%;
  padding: 40px 50px;
  text-align: center;
  color: #111;
  font-size: 18px;
}
.fs-screen .file-input input {
  display: none;
}
.fs-screen .files-list {
  margin-top: 20px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.fs-screen .files-list .title {
  width: 100%;
  font-size: 18px;
  color: #555;
  margin-bottom: 20px;
}
.fs-screen .files-list .item {
  width: 33.33%;
  min-width: 200px;
  border: 1px solid #eee;
  box-shadow: 0 0 5px 2px rgba(0,0,0,0.05);
}
.fs-screen .files-list .item .progress {
  padding: 30px;
  text-align: center;
  font-size: 50px;
  font-family: monospace;
  color: #222;
}
.fs-screen .files-list .item .filename {
  font-size: 16px;
  padding: 5px;
  border-top: 1px solid #eee;
}