options.css

body {
  margin: 0;
  padding-left: 15px;
  padding-top: 53px;
  font-family: "Open Sans", "sans-serif";
  font-size: 13px;
  color: rgb(48, 57, 66);
}

h1 {
  font-size: 1.5em;
  margin-bottom: 0.8em;
  margin-left: 0.3em;
  color: black;
}

h3 {
  font-size: 1.2em;
  margin-bottom: 0.8em;
  color: black;
}

p {
  margin: 0.65em 0;
}

header {
  position: fixed;
  top: 0;
  left: 15px;
  right: 0;
  border-bottom: 1px solid #eee;
  background: linear-gradient(white, white 40%, rgba(255, 255, 255, 0.92));
  z-index: 100000;
}
header, #main {
  min-width: 450px;
  max-width: 450px;
}
#main {
  padding-left: 35px;
  margin-top: 8px;
  margin-bottom: 24px;
}
#main h3 {
  margin-left: -18px;
}

button {
  -webkit-appearance: none;
  position: relative;
  margin: 0 1px 0 0;
  padding: 0 10px;
  min-width: 4em;
  min-height: 2em;
  background-image: linear-gradient(#ededed, #ededed 38%, #dedede);
  border: 1px solid rgba(0, 0, 0, 0.25);
  border-radius: 2px;
  outline: none;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08), inset 0 1px 2px rgba(255, 255, 255, 0.75);
  color: #444;
  text-shadow: 0 1px 0 rgb(240, 240, 240);
  font: inherit;
  user-select: none;
}

input[type="text"] {
  font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
  width: 75px;
  text-align: center;
  border: 1px solid #cccccc;
}

#checkbox-wrapper {
  width: 75px;
  text-align: center;
  display: inline-block;
}

span {
  font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
  width: 90px;
  text-align: center;
  display: inline-block;
}

.settings {
  margin: 10px 0;
}

label, #button-wrap {
  display: inline-block;
  width: 200px;
}

.invalid-value {
  display: inline-block;
  padding-left: 15px;
  color: red;
}

#status {
  display: inline-block;
  font-weight: bold;
  width: 79px;
  text-align: center;
}

select {
  border: 1px solid #cccccc;
}