cartodb/assets/stylesheets/deep-insights/widgets/_form-elements.scss

// Default styles for form elements within widget
// --------------------------------------------------

.CDB-Widget-form {
  height: $baseSize * 3;
}

.CDB-Widget-textInput {
  border: none;
  outline: none;
}

.CDB-Widget-textInput::-webkit-input-placeholder {
  font-weight: 400;
}

.CDB-Widget-textInput::-moz-input-placeholder {
  font-weight: 400;
}

.CDB-Widget-textInput::-ms-input-placeholder {
  font-weight: 400;
}

.CDB-Widget-checkbox {
  display: inline;
  width: $baseSize;
  min-width: $baseSize;
  max-width: $baseSize;
  height: $baseSize;
  margin-top: $baseSize / 4;
  border: 1px solid transparent;
  border-radius: $baseSize / 4;
  vertical-align: top;
}

.CDB-Widget-checkbox.is-checked {
  width: $baseSize + 2;
  min-width: $baseSize + 2;
  max-width: $baseSize + 2;
  height: $baseSize + 2;
  border: 0;
}