excalidraw/src/styles.css

/* http://www.eaglefonts.com/fg-virgil-ttf-131249.htm */
@font-face {
  font-family: "Virgil";
  src: url("https://uploads.codesandbox.io/uploads/user/ed077012-e728-4a42-8395-cbd299149d62/AflB-FG_Virgil.ttf");
  font-display: swap;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.container {
  display: flex;
}

.sidePanel {
  width: 230px;
  background-color: #eee;

  padding: 10px;
}

.sidePanel h4 {
  margin: 10px 0 10px 0;
}

.sidePanel .panelTools {
  display: flex;
}

.sidePanel .panelColumn {
  display: flex;
  flex-direction: column;
}

.tool input[type="radio"] {
  display: none;
}

.tool input[type="radio"] + .toolIcon {
  background-color: #ddd;

  width: 41px;
  height: 41px;

  display: flex;
  justify-content: center;
  align-items: center;

  border-radius: 3px;
}

.tool input[type="radio"]:hover + .toolIcon {
  background-color: #e7e5e5;
}
.tool input[type="radio"]:checked + .toolIcon {
  background-color: #bdbebc;
}

label {
  margin-right: 6px;
}

label span {
  display: inline-block;
}

input[type="number"] {
  width: 30px;
}

input[type="color"] {
  margin: 2px;
}

input {
  margin-right: 5px;
}

button {
  background-color: #ddd;
  border: 1px solid #ccc;
  border-radius: 4px;
  margin: 2px 0;
  padding: 5px;
  outline: none;
}

button:hover {
  background-color: #e7e5e5;
  border-color: #d6d4d4;
}

button:active {
  background-color: #bdbebc;
  border-color: #bdbebc;
}

button:disabled {
  cursor: not-allowed;
}