noVNC/app/styles/input.css

/*
 * noVNC general input element CSS
 * Copyright (C) 2022 The noVNC Authors
 * noVNC is licensed under the MPL 2.0 (see LICENSE.txt)
 * This file is licensed under the 2-Clause BSD license (see LICENSE.txt).
 */

input, select, textarea {
  /* Respect standard font settings */
  font: inherit;
}

input:not([type]),
input[type=date],
input[type=datetime-local],
input[type=email],
input[type=month],
input[type=number],
input[type=password],
input[type=search],
input[type=tel],
input[type=text],
input[type=time],
input[type=url],
input[type=week],
textarea {
  /* Disable default rendering */
  appearance: none;
  background: none;

  padding: 5px;
  border: 1px solid rgb(192, 192, 192);
  border-radius: 5px;
  color: black;
  background: linear-gradient(to top, rgb(255, 255, 255) 80%, rgb(240, 240, 240));
}

input[type=button],
input[type=color],
input[type=image],
input[type=reset],
input[type=submit],
button,
select {
  /* Disable default rendering */
  appearance: none;
  background: none;

  padding: 5px;
  border: 1px solid rgb(192, 192, 192);
  border-bottom-width: 2px;
  border-radius: 5px;
  color: black;
  background: linear-gradient(to top, rgb(255, 255, 255), rgb(240, 240, 240));

  /* This avoids it jumping around when :active */
  vertical-align: middle;
}

input[type=button],
input[type=color],
input[type=reset],
input[type=submit],
button {
  padding-left: 20px;
  padding-right: 20px;
}

select {
  --select-arrow: calc(100% - 7px) no-repeat url('data:image/svg+xml;utf8, \
      <svg width="8" height="6" version="1.1" viewBox="0 0 8 6" \
           xmlns="http://www.w3.org/2000/svg"> \
          <path d="m6.5 1.5 -2.5 3 -2.5 -3 5 0" stroke-width="3" \
                stroke="rgb(31,31,31)" fill="none" \
                stroke-linecap="round" stroke-linejoin="round" /> \
      </svg>');
  background: var(--select-arrow),
              linear-gradient(to top, rgb(255, 255, 255), rgb(240, 240, 240));
  padding-right: calc(2*7px + 8px);
  padding-left: 7px;
}
:root:not(.noVNC_touch) select:hover:not(:disabled) {
  background: var(--select-arrow),
              linear-gradient(to top, rgb(255, 255, 255), rgb(250, 250, 250));
}

option {
  color: black;
  background: white;
}

input[type=checkbox] {
  position: relative;
  appearance: none;
  border: 1px solid dimgrey;
  border-radius: 3px;
  width: 0.8em;
  height: 0.8em;
  vertical-align: bottom;
}
input[type=checkbox]:checked {
  background-color: rgb(110, 132, 163);
  border-color: rgb(110, 132, 163);
}
input[type=checkbox]:checked::after {
  content: "";
  position: absolute;
  top: 0;
  left: 3px;
  width: 3px;
  height: 7px;
  border: 1px solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(40deg);
}

input[type=range] {
  appearance: none;
  border-radius: 3px;
  height: 20px;
  background: transparent;
}
/* -webkit-slider.. & -moz-range.. cant be in selector lists:
   https://bugs.chromium.org/p/chromium/issues/detail?id=1154623 */
input[type=range]::-webkit-slider-runnable-track {
  background-color: rgb(110, 132, 163);
  height: 6px;
  border-radius: 3px;
}
input[type=range]::-moz-range-track {
  background-color: rgb(110, 132, 163);
  height: 6px;
  border-radius: 3px;
}
input[type=range]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 20px;
  border-radius: 5px;
  background-color: white;
  border: 1px solid dimgray;
  margin-top: -7px;
}
input[type=range]::-moz-range-thumb {
  appearance: none;
  width: 18px;
  height: 20px;
  border-radius: 5px;
  background-color: white;
  border: 1px solid dimgray;
  margin-top: -7px;
}

input:not([type]):focus-visible,
input[type=button]:focus-visible,
input[type=color]:focus-visible,
input[type=image]:focus-visible,
input[type=date]:focus-visible,
input[type=datetime-local]:focus-visible,
input[type=email]:focus-visible,
input[type=month]:focus-visible,
input[type=number]:focus-visible,
input[type=password]:focus-visible,
input[type=reset]:focus-visible,
input[type=search]:focus-visible,
input[type=submit]:focus-visible,
input[type=tel]:focus-visible,
input[type=text]:focus-visible,
input[type=time]:focus-visible,
input[type=url]:focus-visible,
input[type=week]:focus-visible,
input[type=checkbox]:focus-visible,
input[type=range]:focus-visible,
button:focus-visible,
select:focus-visible,
textarea:focus-visible {
  box-shadow: 0px 0px 3px rgba(74, 144, 217, 0.5);
  border-color: rgb(74, 144, 217);
  outline: none;
}

input:not([type]):disabled,
input[type=button]:disabled,
input[type=color]:disabled,
input[type=image]:disabled,
input[type=date]:disabled,
input[type=datetime-local]:disabled,
input[type=email]:disabled,
input[type=month]:disabled,
input[type=number]:disabled,
input[type=password]:disabled,
input[type=reset]:disabled,
input[type=search]:disabled,
input[type=submit]:disabled,
input[type=tel]:disabled,
input[type=text]:disabled,
input[type=time]:disabled,
input[type=url]:disabled,
input[type=week]:disabled,
button:disabled,
select:disabled,
textarea:disabled {
  color: rgb(128, 128, 128);
  background: rgb(240, 240, 240);
}
input[type=checkbox]:disabled,
input[type=range]:disabled {
  opacity: 0.4;
}

input[type=button]:active,
input[type=color]:active,
input[type=image]:active,
input[type=reset]:active,
input[type=submit]:active,
button:active,
select:active {
  border-bottom-width: 1px;
  margin-top: 1px;
}

:root:not(.noVNC_touch) input[type=button]:hover:not(:disabled),
:root:not(.noVNC_touch) input[type=color]:hover:not(:disabled),
:root:not(.noVNC_touch) input[type=image]:hover:not(:disabled),
:root:not(.noVNC_touch) input[type=reset]:hover:not(:disabled),
:root:not(.noVNC_touch) input[type=submit]:hover:not(:disabled),
:root:not(.noVNC_touch) button:hover:not(:disabled) {
  background: linear-gradient(to top, rgb(255, 255, 255), rgb(250, 250, 250));
}