gitea/web_src/css/features/dropzone.css

@keyframes passing-through {
  0% { opacity: 0; transform: translateY(40px); }
  30%, 70% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-40px); }
}

@keyframes slide-in {
  0% { opacity: 0; transform: translateY(40px); }
  30% { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0% { transform: scale(1); }
  10% { transform: scale(1.1); }
  20% { transform: scale(1); }
}

.dropzone {
  min-height: 150px;
  border-radius: 5px;
  padding: 20px;
}

.dropzone.dz-clickable {
  cursor: pointer;
}

.dropzone.dz-clickable * {
  cursor: default;
}

.dropzone.dz-clickable .dz-message,
.dropzone.dz-clickable .dz-message * {
  cursor: pointer;
}

.dropzone.dz-started .dz-message {
  display: none;
}

.dropzone.dz-drag-hover {
  border-style: solid;
}

.dropzone.dz-drag-hover .dz-message {
  opacity: .5;
}

.dropzone .dz-message {
  text-align: center;
  margin: 10px 0;
}

.dropzone .dz-message .dz-button {
  background: none;
  color: inherit;
  border: none;
  padding: 0;
  font: inherit;
  cursor: pointer;
  outline: inherit;
}

.dropzone .dz-preview {
  position: relative;
  display: inline-block;
  vertical-align: top;
  margin: 16px;
  min-height: 100px;
}

.dropzone .dz-preview:hover {
  z-index: 1000;
}

.dropzone .dz-preview:hover .dz-details {
  opacity: 1;
}

.dropzone .dz-preview.dz-file-preview .dz-details {
  opacity: 1;
}

.dropzone .dz-preview .dz-remove {
  font-size: 14px;
  text-align: center;
  display: block;
  cursor: pointer;
  border: none;
}

.dropzone .dz-preview .dz-remove:hover {
  text-decoration: underline;
}

.dropzone .dz-preview .dz-details {
  z-index: 20;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  font-size: 13px;
  min-width: 100%;
  max-width: 100%;
  padding: 2em 1em;
  text-align: center;
  color: var(--color-text);
  line-height: 150%;
}

.dropzone .dz-preview .dz-details .dz-size {
  margin-bottom: 1em;
  font-size: 16px;
}

.dropzone .dz-preview .dz-details .dz-filename {
  white-space: nowrap;
}

.dropzone .dz-preview .dz-details .dz-filename:not(:hover) {
  overflow: hidden;
  text-overflow: ellipsis;
}

.dropzone .dz-preview .dz-details .dz-filename:not(:hover) span {
  border: 1px solid transparent;
}

.dropzone .dz-preview .dz-details .dz-filename span,
.dropzone .dz-preview .dz-details .dz-size span {
  padding: 0 0.4em;
  border-radius: 3px;
}

.dropzone .dz-preview:hover .dz-image img {
  transform: scale(1.05, 1.05);
  filter: opacity(0.5);
}

.dropzone .dz-preview .dz-image {
  border-radius: 20px;
  overflow: hidden;
  width: 120px;
  height: 120px;
  position: relative;
  display: block;
  z-index: 10;
}

.dropzone .dz-preview .dz-image img {
  display: block;
}

.dropzone .dz-preview.dz-success .dz-success-mark {
  animation: passing-through 3s cubic-bezier(0.77, 0, 0.175, 1);
}

.dropzone .dz-preview.dz-error .dz-error-mark {
  opacity: 1;
  animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1);
}

.dropzone .dz-preview .dz-success-mark,
.dropzone .dz-preview .dz-error-mark {
  pointer-events: none;
  opacity: 0;
  z-index: 500;
  position: absolute;
  display: block;
  top: 50%;
  left: 50%;
  margin-left: -27px;
  margin-top: -27px;
  border-radius: 50%;
}

.dropzone .dz-preview .dz-success-mark svg,
.dropzone .dz-preview .dz-error-mark svg {
  display: block;
  width: 54px;
  height: 54px;
  fill: var(--color-text);
}

.dropzone .dz-preview.dz-processing .dz-progress {
  opacity: 1;
  transition: all 0.2s linear;
}

.dropzone .dz-preview.dz-complete .dz-progress {
  opacity: 0;
  transition: opacity 0.4s ease-in;
}

.dropzone .dz-preview:not(.dz-processing) .dz-progress {
  animation: pulse 6s ease infinite;
}

.dropzone .dz-preview .dz-progress {
  opacity: 1;
  z-index: 1000;
  pointer-events: none;
  position: absolute;
  height: 20px;
  top: 7em; /* by default the progress-bar was vertically centered (top: 50%), it's better to put it after the "details (size, filename)", then the layout from top to bottom is: size, filename, progress */
  margin-top: -10px;
  left: 15%;
  right: 15%;
  border: 3px solid transparent;
  border-radius: 10px;
  overflow: hidden;
}

.dropzone .dz-preview .dz-progress .dz-upload {
  display: block;
  position: relative;
  height: 100%;
  width: 0;
  transition: width 300ms ease-in-out;
  border-radius: 17px;
}

.dropzone .dz-preview.dz-error .dz-error-message {
  display: block;
}

.dropzone .dz-preview.dz-error:hover .dz-error-message {
  opacity: 1;
  pointer-events: auto;
}

.dropzone .dz-preview .dz-error-message {
  pointer-events: none;
  z-index: 1000;
  position: absolute;
  display: block;
  display: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  border-radius: 8px;
  font-size: 13px;
  top: 130px;
  left: -10px;
  width: 140px;
  background: var(--color-red);
  padding: 0.5em 1em;
  color: var(--color-white);
}

.dropzone .dz-preview .dz-error-message::after {
  content: "";
  position: absolute;
  top: -6px;
  left: 64px;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 6px solid var(--color-red);
}

.ui .field .dropzone {
  border: 2px dashed var(--color-secondary);
  background: none;
  box-shadow: none;
  padding: 0;
  border-radius: var(--border-radius-medium);
  min-height: 0;
}

.dropzone .dz-button {
  color: var(--color-text-light) !important;
}

.dropzone:hover .dz-button {
  color: var(--color-text) !important;
}

.dropzone .dz-error-message {
  top: 145px !important;
}

.dropzone .dz-image {
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  border-radius: 0 !important;
}

.dropzone .dz-image img {
  max-width: 100% !important;
  max-height: 100% !important;
  object-fit: contain !important;
}

.dropzone-attachments .thumbnails img {
  background: transparent !important;
  height: 120px !important;
  width: 120px !important;
  object-fit: contain !important;
  margin-bottom: 0 !important;
}