index.css

* {
  box-sizing: border-box;
}

body, div, p, textarea, pre {
  margin: 0;
  padding: 0;
  line-height: 1.5em;
  font: inherit;
}

body {
  font-size: 1em;
  padding: 1em;
  margin: 0 auto;
  max-width: 60em;

  background: white;
  color: black;
}

body, .CodeMirror {
  font-family: Noto Sans, sans-serif;
}

select, input, button {
  font: inherit;
  font-size: 1em;
}

input {
  border: 1px solid #ccc;
  max-width: 100%;
}

h1, h2, code, input[type=url], #num-chosen-scripts {
  font-family: Noto Sans, sans-serif;
}

h1 {
  font-weight: 700;
  font-size: 1.5em;
}

h1 span {
  font-weight: 400;
  font-size: 1.125rem;
  letter-spacing: 0;
}

h1 span a {
  margin-right: 0.5em;
}

h1 span a b {
  font-weight: 600;
}

a#title {
  background: none;
  margin-right: 0.5em;
}

a {
  color: black;
  text-decoration: none;
  background: #fffccc;
  cursor: pointer;
}
a:hover {
  border-bottom: 0.1em solid;
  cursor: pointer;
  background: #fffc7d;
}
a:active {
  opacity: 0.4;
}

p {
  margin: 0 0 1.5rem;
  line-height: 1.5em;
}

p a {
  background: none;
  border-bottom: 0.08em #aaa solid;
  border-radius: 0;
  padding: 0;
  top: 0;
  -webkit-transition: top 200ms ease-in;
  position: relative;
}
p a:visited {
  color: #aaa;
}
p a:hover, p a:visited:hover {
  background: none;
  color: #006ed8;
  border-bottom-color: #006ed8;
  -webkit-transition: color 100ms linear, border-bottom-color 100ms linear;
}
p a:active {
  top: 0.05em;
  -webkit-transition: none;
  opacity: 1;
}





label {
  font-weight: bold;
  cursor: pointer;
}

button, .button {
  display: inline-block;
  font-size: 1.25em;
  margin-bottom: 1em;
  padding: 2px 4px;
  color: black;

  font-weight: 500;
  position: relative;
  top: -2px;
  left: -2px;
  vertical-align: middle;
  /*-webkit-appearance: none;
  outline: none;*/
  -webkit-transition: none;
}
button, .button, button:hover, .button:hover, .button:visited {
  background: #f0f0f0;
  border: 1px solid #aaa;
  border-bottom-width: 3px;
  cursor: default;
  color: black;
  -webkit-transition: none;
}
button:focus, .button:focus {
  /*box-shadow: 0 0 1px rgba(0, 0, 255, 0.5);*/
}
button:active, button.pressed, .button:active, .button.pressed {
  border-bottom-width: 1px;
  border-top-width: 2px;
  background: #e0e0e0;
  baseline: 2px;
  color: black;
  opacity: 1;
}




/* editor */

#lang-status {
  font-size: 0.6rem;
  line-height: 1em;
}

#editor {
  position: relative;
  overflow: hidden;
  margin: 1em 0;
  border: 1px solid #bbb;
  max-width: 40em;
  height: 16em;
  width: 100%;

  color: rgba(0, 0, 0, 0.9);
}

.CodeMirror {
  letter-spacing: +0.5px;
  line-height: 1.5em;
  font-size: 1em;
}

.CodeMirror .CodeMirror-placeholder {
  color: #aaa;
}

.CodeMirror-linenumber {
  font-size: 0.85rem;
  line-height: 1.5rem;
  min-width: 17px;
}

.sb2 {
  margin: 0;
  margin-bottom: 20px;
}

#preview {
  position: relative;
}

.export-link {
  display: inline-block;
  margin-left: 2px;
  margin-top: 2em;
  margin-right: 1em;
}


@media screen and (min-width: 62em) {
  body {
    padding: 1em 2em;
    max-width: none;
  }

  h1 {
    position: relative;
  }
  h1 span {
    display: block;
    position: absolute;
    top: 0;
    left: 45%;
    margin-left: 2rem;
  }

  #preview, #side {
    position: absolute;
    bottom: 2em; left: 2em; right: 2em;
  }

  #editor {
    position: absolute;
    top: 3.25em; bottom: 0; left: 2em; right: 0;
    margin: 0;
    height: 30em;
  }

  #side {
    top: 4.75em;
    left: 45%;
    padding-left: 2em;
  }

  #preview {
    top: 8em;
    right: 55%;
  }

  .export-link {
    margin-top: 0;
    margin-left: 0;
    margin-right: 0.5em;
  }
}

@media screen and (max-width: 32em) {
  h1 span {
    display: block;
    margin: 1.5rem 0 1rem;
  }
  h1 span a {
    padding: 0.25em 0.5em;
  }

  select {
    margin: 1rem 0;
  }
}



/* editor: to be used in future */

.cm-s-number { color: #4548af; }
.cm-s-string, .cm-s-menu { color: #904949; }
.cm-s-color { color: #b09542; }
.cm-s-comment { color: #c8b898; }

.cm-s-green { color: #488d00; }

.cm-s-error { color: #e21313; }
.cm-s-motion { color: #4a6cd4; }
.cm-s-looks { color: #8a55d7; }
.cm-s-sound { color: #bb42c3; }
.cm-s-pen { color: #0e9a6c; }
.cm-s-events { color: #c88330; }
.cm-s-control, .false { color: #e1a91a; }
.cm-s-sensing { color: #2ca5e2; }
.cm-s-operators { color: #5cb712; }
.cm-s-variable { color: #ee7d16; }
.cm-s-custom { color: #632d99; }
.cm-s-parameter { color: #5947b1; }
.cm-s-list { color: #cc5b22; }
.cm-s-extension { color: #4b4a60; }
.cm-s-grey { color: #888; }

.bg-motion { background: #4a6cd4; }
.bg-looks { background: #8a55d7; }
.bg-sound { background: #bb42c3; }
.bg-pen { background: #0e9a6c; }
.bg-events { background: #c88330; }
.bg-control, .false { background: #e1a91a; }
.bg-sensing { background: #2ca5e2; }
.bg-operators { background: #5cb712; }
.bg-variable { background: #ee7d16; }
.bg-custom { background: #632d99; }















/* for generator */


/* Row */

#header, #wrap, #sprites-list-wrap, #intro {
  position: absolute;
  overflow: hidden;
  left: 0;
  right: 0;
  padding: 1em;
}

#header {
  top: 0;
}


/* Column */

#left-pane, #sprite-detail, #intro {
  position: absolute;
  overflow: hidden;
  overflow-y: auto;
  top: 0;
  right: 0;
  bottom: 0;
  padding: 2em;
}


/* Intro pane */

#intro {
  z-index: 201;
  background: #fff;
  padding: 1em 2em;
}
.hidden {
  display: none;
}


/* Header stuff */

#header {
  height: 9.5em;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  z-index: 202;
  padding: 1em 2em;
}


#project-url {
  font-size: 1.25em;
  font-weight: 100;
  color: rgba(0, 0, 0, 0.75);
  width: 24em;
}
#fetch {
  margin: 0;
}
#status {
  display: inline-block;
  margin-left: 0.5em;
}
#bookmarklet {
  background: #888;
  color: #fff;
  border-radius: 1em;
  text-decoration: none;
  padding: 0.125em 0.25em;
  font-size: 0.9em;
}


#wrap {
  top: 9.5em;
  bottom: 0;
}


/* Left pane */

#left-pane {
  width: 14rem;
  left: 0;
}
#sprites-list-wrap {
  overflow-y: auto;
  top: 9.5em;
  bottom: 2em;
  margin: 0 2em;
  padding: 0;
  border: 1px solid #888;
}
#sprites-list {
  border-right: 0.5em solid #4ca6fb;
  min-height: 2em;
  margin: 0;
  padding: 0;
  list-style: none;
  cursor: default;
  min-height: 100%;
}
#sprites-list > li {
  padding: 0.125em 0.5em;
  border-bottom: 1px solid #eee;
}
#sprites-list > li.selected {
  background: #4ca6fb;
}


#chosen-scripts-info {
}
#num-chosen-scripts {
  font-size: 2em;
  float: left;
  margin-right: 0.25em;
  min-width: 1.125em;
  text-align: right;
}
#export {
  clear: both;
}


/* Right pane */

#sprite-detail {
  left: 12rem;
  right: 0;
}
#sprite-info {
  overflow: hidden; /* clearfix */
}


#sprite-name {
  float: left;
  font-size: 1.5em;
  margin: 0 1.2222222em;
}
#costume-preview {
  float: left;
  width: 6em;
  height: 6em;
  border: 1px solid #888;
}
#costume-preview img {
  width: 100%;
}




img .hidden {
  position: absolute;
  opacity: 0;
}