diff --git a/src/epub_converter/css_preprocessing.py b/src/epub_converter/css_preprocessing.py
index 29021ec..2e65880 100644
--- a/src/epub_converter/css_preprocessing.py
+++ b/src/epub_converter/css_preprocessing.py
@@ -21,7 +21,7 @@ def get_bg_color(x):
     return color
 
 
-def convert_tag_style_values(size_value: str) -> str:
+def convert_tag_style_values(size_value: str, is_indent: bool = False) -> str:
     """
     Function
     - converts values of tags from em/%/pt to px
@@ -33,27 +33,23 @@ def convert_tag_style_values(size_value: str) -> str:
     Returns
     -------
     size_value: str
-
+        converted value size
     """
-    def find_closest_size(style_value):
-        possible_sizes = list(
-            takewhile(lambda x: style_value >= x, LiveCartaConfig.sizes_pr))
-        last_possible_size_index = LiveCartaConfig.sizes_pr.index(
-            possible_sizes[-1])
-        return LiveCartaConfig.sizes_px[last_possible_size_index]
-
-    font_size_regexp = re.compile(
+    size_regexp = re.compile(
         r"(^-*(\d*\.*\d+)%$)|(^-*(\d*\.*\d+)em$)|(^-*(\d*\.*\d+)pt$)")
-    has_style_attrs = re.search(font_size_regexp, size_value)
+    has_style_attrs = re.search(size_regexp, size_value)
     if has_style_attrs:
         if has_style_attrs.group(1):
-            size_value = float(size_value.replace("%", ""))*6
+            multiplier = 5.76 if is_indent else 0.16
+            size_value = float(size_value.replace("%", "")) * multiplier
             return str(size_value)+'px'
         elif has_style_attrs.group(3):
-            size_value = float(size_value.replace("em", ""))
-            return find_closest_size(size_value)
+            multiplier = 18 if is_indent else 16
+            size_value = float(size_value.replace("em", "")) * multiplier
+            return str(size_value)+'px'
         elif has_style_attrs.group(5):
-            return size_value.replace("pt", "px")
+            size_value = float(size_value.replace("pt", "")) * 4/3
+            return str(size_value)+'px'
         else:
             return ""
     return size_value
@@ -73,10 +69,10 @@ def convert_indents_tag_values(size_value: str) -> str:
     """
     if len(size_value.split(" ")) == 3:
         size_value = convert_tag_style_values(size_value.split(
-            " ")[-2])  # returns middle value
+            " ")[-2], True)  # returns middle value
     else:
         size_value = convert_tag_style_values(size_value.split(
-            " ")[-1])  # returns last value
+            " ")[-1], True)  # returns last value
     return size_value
 
 
@@ -146,7 +142,7 @@ LIVECARTA_STYLE_ATTRS_MAPPING = {
     "list-style-image": lambda x: "disc",
     "margin-left": convert_indents_tag_values,
     "margin-top": convert_tag_style_values,
-    "margin": convert_indents_tag_values
+    "margin": convert_indents_tag_values,
 }
 
 
diff --git a/src/livecarta_config.py b/src/livecarta_config.py
index 0f6b0a1..9fc8e2e 100644
--- a/src/livecarta_config.py
+++ b/src/livecarta_config.py
@@ -76,16 +76,6 @@ class LiveCartaConfig:
 
     INDENT = "30px"
 
-    sizes_pr = [-100, -1, 0.5, 0.56, 0.63, 0.69, 0.75, 0.81, 0.88, 0.94, 1.0,
-                1.06, 1.13, 1.19, 1.25, 1.31, 1.38, 1.44, 1.5, 1.56, 1.63, 1.69,
-                1.75, 1.81, 1.88, 1.94, 2.0, 2.06, 2.13, 2.19, 2.25, 2.31, 2.38,
-                2.44, 2.5, 2.56, 2.63, 2.69, 2.75, 2.81, 2.88, 2.94, 3.0, 4.0, 5.0]
-
-    sizes_px = ["0px", "10px", "10px", "11px", "12px", "13px", "14px", "15px", "16px", "17px", "18px",
-                "19px", "20px", "21px", "22px", "23px", "24px", "25px", "26px", "27px", "28px", "29px",
-                "30px", "31px", "32px", "33px", "34px", "35px", "36px", "37px", "38px", "39px", "40px",
-                "41px", "42px", "43px", "44px", "45px", "46px", "47px", "48px", "49px", "50px", "64px", "72px"]
-
     list_types = ["circle", "disc", "armenian", "decimal",
                   "decimal-leading-zero", "georgian", "lower-alpha", "lower-latin",
                   "lower-roman", "upper-alpha", "upper-latin", "upper-roman", "none"]