ul {
 list-style: none;
}

.input-requirements {
  font-size: 12px;
  font-style: italic;
  text-align: left;
  list-style: disc;
  list-style-position: inside;
  margin: 10px auto;
  color: rgb(150,150,150);
}

.input-requirements li.invalid {
 color: #e74c3c;
}
.input-requirements li.valid {
 color: #2ecc71;
}
.input-requirements li.valid:after {
 display: inline-block;
 padding-left: 10px;
 content: "\2713";
}