Currently the skin colors are applied to

input[type="email"]
input[type="text"]
input[type="password"]

but not

input[type="url"]
input[type="time"]
input[type="date"]
input[type="datetime-local"]
input[type="tel"]
input[type="number"]

this can be fixed in scss file "sass/mdb/pro/_skins.scss", change 'Custom inputs' to following

// Custom inputs
input[type="email"]:focus:not([readonly]),
input[type="text"]:focus:not([readonly]),
input[type="password"]:focus:not([readonly]),
input[type="url"]:focus:not([readonly]),
input[type="time"]:focus:not([readonly]),
input[type="date"]:focus:not([readonly]),
input[type="datetime-local"]:focus:not([readonly]),
input[type="tel"]:focus:not([readonly]),
input[type="number"]:focus:not([readonly]),
textarea.md-textarea:focus:not([readonly]) {
  border-color: map-get($data, skin-accent);
  box-shadow: 0 1px 0 0 map-get($data, skin-accent);
  & + label {
    color: map-get($data, skin-accent);
  }
}


without the fix the blue color from 'mdb/free/_forms-basic.scss' is used