* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  padding: 1em;
  font-family: "Open Sans";
  font-size: 14px;
  font-weight: 300;
  background-color: #272727;
  color: #1a1a1a;
}

section {
  width: 400px;
  margin: 0 auto;
}

input {
  width: 100%;
  padding: 16px 8px;
  font-size: 16px;
  outline: none;
  background-color: #b7b7b7;
  border: none;
  color: #1a1a1a;
}

.List {
  width: 100%;
  margin: 8px 0;
}
.List > li {
  padding: 12px 8px;
  background-color: #e9e9e9;
  border-bottom: 1px solid #1a1a1a;
  transition: all 0.1s ease;
  font-size: 15px;
  font-weight: 700;
}
.List > li.is-hidden {
  height: 0;
  font-size: 0;
  padding: 0;
  border: none;
  visibility: hidden;
}

::-webkit-input-placeholder {
  color: #1a1a1a;
}

:-moz-placeholder {
  /* Firefox 18- */
  color: #1a1a1a;
}

::-moz-placeholder {
  /* Firefox 19+ */
  color: #1a1a1a;
}