app/assets/stylesheets/modules/_form.css.scss

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form {
  &.form-full-width {
    .uneditable-input,
    select,
    textarea,
    input {
      @include input-block-level;
    }
    /* override radio and checkbox */
    input[type="radio"],
    input[type="checkbox"] {
      display: inline-block;
      width: auto;
      min-height: auto;
    }
    .btn {
      @extend .btn-block;
    }
    .input-large {
      min-height: $baseLineHeight * 2;
      height: $baseLineHeight * 2;
    }
    .btn-large {
      padding: 9px 19px; // http://git.io/D9i_5g
    }
  }
}

label.required abbr {
  color: #CC0000;
}

/* fix the left margin when apply the span* classes */
.compound-controls {
  margin-left: 0;
}

.form-actions > .btn {
  margin-right: 5px;
}

.compound_datetime {
  @include clearfix;
  .date {
    float: left;
  }
  .time {
    float: left;
    margin-left: 15px;
  }
  .datepicker {
    width: 6em;
  }
  .timepicker {
    width: 6em;
    margin-top: 1px;
  }
  .add-on {
    margin-top: 1px;
  }
}