:root {
  --primary: #121212;
  --primary-text: #689f38;
  --error: #9f3838;
}

body {
  height: 100vh;
  margin: 0;
  background-color: var(--primary);
  color: var(--primary-text);
  font-size: 1.3em;
  font-family: Arial, Helvetica, sans-serif;
  display: grid;
  grid-template-rows: minmax(0, 6fr) minmax(0, 1fr) minmax(0, 1fr);
}

main {
  /*height: calc(100vh - 250px);
  width: 100vw;*/
  display: inline-grid;
  grid-template-columns: 1fr 4fr;
  height: 100%;
}

main > section {
  overflow: auto;
  overflow-x: hidden;
  overflow-y: auto;
  padding: 2em;
  max-height: 100%;
}

aside {
  padding: 2em;
  background-color: hsla(0, 100%, 100%, 0.05);
	box-shadow:
		0px 1px 1px 0px hsla(0,0%,0%,0.14), 
		0px 2px 1px -1px hsla(0,0%,0%,0.12), 
		0px 1px 3px 0px hsla(0,0%,0%,0.2);
}

aside h3 {
  margin-bottom: 0.2em;
}

footer {
  display: inline-grid;
  grid-template-columns: 1fr 4fr;
}


footer > div {
  padding: 2em;
}

input[type="text"] {
  all: unset;
  padding: 0.3em;
  background-color: var(--primary);
  color: var(--primary-text);
  font-size: 1em;
  margin-top: 1em;
  border-bottom: 3px solid var(--primary-text);
  width: 80%;
}

#options {
  background-color: var(--primary);
  color: var(--primary-text);
  font-size: 1em;
  display: flex;
  margin-top: 1em;
  height: 40px;
}

#options > * {
  margin-left: 1em;
  border: 1px solid var(--primary-text);
  background-color: var(--primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  padding: 0.3em;
  border-radius: 0.3em;
}

#items {
  max-height: 200px;
  overflow: auto;
}

.disable {
  color: var(--error);
  border: 1px solid var(--error) !important;
}

.btn {
  position: relative;

  display: block;
  margin: 30px auto;
  padding: 0;

  overflow: hidden;

  border-width: 0;
  outline: none;
  border-radius: 2px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, .6);
  
  background-color: var(--primary-text);
  color: #ecf0f1;
  
  transition: background-color .3s;
}

.btn:hover, .btn:focus {
  background-color: #27ae60;
}

.btn > * {
  position: relative;
}

.btn span {
  display: block;
  padding: 12px 24px;
}

.btn:before {
  content: "";
  
  position: absolute;
  top: 50%;
  left: 50%;
  
  display: block;
  width: 0;
  padding-top: 0;
    
  border-radius: 100%;
  
  background-color: rgba(236, 240, 241, .3);
  
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.btn:active:before {
  width: 120%;
  padding-top: 120%;
  
  transition: width .2s ease-out, padding-top .2s ease-out;
}