调整表单组件样式，实现提交按钮底部固定显示，实现文本域组件按行高度

Tevin

2021-07-08 0624a0e6ae3dc366f020c7be531ace6a099a664b

 forms/form/cForm.scss

@@ -73,5 +73,15 @@
                display: none;
            }
        }
        &.c-form-submit-fixed {
            height: 80px;
            .c-form-submit-inner {
                @include position(fixed, n 0 0 n, 10);
                width: 100%;
                padding: 20px 20px 30px;
                box-sizing: border-box;
                background-color: #fff;
            }
        }
    }
}