styles.css

/* Source: Bootstrap 4.2.1 */
/* BEGIN BOOTSTRAP */
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  text-align: left;
  background-color: #fff;
}
.container {
  /* width: 100%; */
  padding-right: 15px;
  padding-left: 15px;
  margin-right: auto;
  margin-left: auto;
}
.btn {
  display: inline-block;
  font-weight: 400;
  color: #212529;
  text-align: center;
  vertical-align: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  background-color: transparent;
  border: 1px solid transparent;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: 0.25rem;
  transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.btn-light {
  color: #212529;
  background-color: #f8f9fa;
  border-color: #f8f9fa;
}

.btn-light:hover {
  color: #212529;
  background-color: #e2e6ea;
  border-color: #dae0e5;
}

.btn-light:focus, .btn-light.focus {
  box-shadow: 0 0 0 0.2rem rgba(216, 217, 219, 0.5);
}

.btn-light.disabled, .btn-light:disabled {
  color: #212529;
  background-color: #f8f9fa;
  border-color: #f8f9fa;
}
button {
  border-radius: 0;
}

button:focus {
  outline: 1px dotted;
  outline: 5px auto -webkit-focus-ring-color;
}

input,
button,
select,
optgroup,
textarea {
  margin: 0;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

button,
input {
  overflow: visible;
}

button,
select {
  text-transform: none;
}
.text-center {
  text-align: center !important;
}
.float-left {
  float: left !important;
}
.float-right {
  float: right !important;
}
/* END BOOTSTRAP */

body {
  background-color: #333;
}
#canvas {
  border: 1px solid black;
  margin-top: 20px;
}
#toolbar {
  margin: 0 auto;
  width: 100px;
}
.dot {
  display: inline-block;
  height: 31px;
  width: 31px;
  border-radius: 50%;
  margin: 0 3px;
}
.color-option-selected {
  height: 25px;
  width: 25px;
  border: 3px solid white;
}