diff --git a/_pages/Year_1_Course_Guide/seng_guide.css b/_pages/Year_1_Course_Guide/seng_guide.css
index 4ec8703..430f4cf 100644
--- a/_pages/Year_1_Course_Guide/seng_guide.css
+++ b/_pages/Year_1_Course_Guide/seng_guide.css
@@ -12,7 +12,6 @@ summary:before {
 }
 
 summary {
-    background-color: aquamarine;
     display: flex;
     align-items: center;
     padding: 5px 0px 5px 20px;
@@ -32,7 +31,7 @@ details[open] summary:before {
     transform: rotate(90deg);
 }
 
-details[open] > :not(:first-child) {
+details[open] > :not(summary) {
     padding: 10px;
     opacity: 1;
     height: auto;
diff --git a/_pages/Year_1_Course_Guide/seng_guide.md b/_pages/Year_1_Course_Guide/seng_guide.md
index 785c095..1e002aa 100644
--- a/_pages/Year_1_Course_Guide/seng_guide.md
+++ b/_pages/Year_1_Course_Guide/seng_guide.md
@@ -74,7 +74,7 @@ For the latest information, refer to [major requirements](https://prog-crs.hkust
 <!-- Edit this file for collapsible displays -->
 <link rel="stylesheet" href="seng_guide.css">
 
-<details>
+<details markdown="1">
 <summary>BIEN</summary>
 
 - [BIEN1010](https://ust.space/review/BIEN1010) (Spring) \[3\] > [CENG1000](https://ust.space/review/CENG1000) (Fall) \[3\]
@@ -83,9 +83,9 @@ For the latest information, refer to [major requirements](https://prog-crs.hkust
 - [BIEN2410](https://ust.space/review/BIEN2410) (Spring) \[3\] (if DSE Biology >= 3 or LIFS1901 in Fall)
 - [CENG2220](https://ust.space/review/CENG2220) (Spring) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>CENG</summary>
 
 - [BIEN1010](https://ust.space/review/BIEN1010) (Spring) \[3\] > CENG1600 (Fall) \[3\] > CENG1700 (Fall) \[3\]
@@ -93,9 +93,9 @@ For the latest information, refer to [major requirements](https://prog-crs.hkust
 - [CHEM1020](https://ust.space/review/CHEM1020) \[3\]
 - [CENG2220](https://ust.space/review/CENG2220) (Spring) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>CEEV</summary>
 
 - [CENG1700](https://ust.space/review/CENG1700) (Fall) \[3\]
@@ -103,27 +103,27 @@ For the latest information, refer to [major requirements](https://prog-crs.hkust
 - [CHEM1020](https://ust.space/review/CHEM1020) \[3\]
 - [CENG2220](https://ust.space/review/CENG2220) (Spring) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>SUSEE</summary>
 
 - [MECH1902](https://ust.space/review/MECH1902) (Fall) \[3\] > [CENG1700](https://ust.space/review/CENG1700) (Fall) \[3\] = [SUST1000](https://ust.space/review/SUST1000) \[3\]
 - ENEG3110 (Fall) \[3\]
 - [CHEM1020](https://ust.space/review/CHEM1020) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>CIVL/CIEV</summary>
 
 - [CIVL1100](https://ust.space/review/CIVL1100) \[3\]
 - [CIVL2110](https://ust.space/review/CIVL2110) (Spring) \[3\]
 - [CHEM1020](https://ust.space/review/CHEM1020) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>COMP/CPEG/DSCT</summary>
 
 Remark: You can access COMP course pages with <https://course.cse.ust.hk/\[insert_course_code\>] **even if you're not enrolled in it**
@@ -136,9 +136,9 @@ Remark: You can access COMP course pages with <https://course.cse.ust.hk/\[inser
   - [COMP2711H](https://ust.space/review/COMP2711H) \[4\] if you can meet the prerequisite
   - Remark: WIP
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>CPEG/ELEC</summary>
 
 - [ELEC1100](https://ust.space/review/ELEC1100) \[4\]
@@ -147,9 +147,9 @@ Remark: You can access COMP course pages with <https://course.cse.ust.hk/\[inser
   - [PHYS1114](https://ust.space/review/PHYS1114) \[3\]
   - [PHYS1314](https://ust.space/review/PHYS1314) \[3\] (if and only if you are a PHYS god)
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>DA/IEEM</summary>
 
 - one of
@@ -158,9 +158,9 @@ Remark: You can access COMP course pages with <https://course.cse.ust.hk/\[inser
 - [IEDA3230](https://ust.space/review/IEDA3230) (Spring) \[3\]
 - [IEDA3300](https://ust.space/review/IEDA3300) (if available, Spring) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>ISDN</summary>
 
 Remark: don't expect good grades in ISDN, and grades won't matter for getting into it since the major is _project-based_
@@ -173,9 +173,9 @@ Remark: don't expect good grades in ISDN, and grades won't matter for getting in
 - [ISDN2602](https://ust.space/review/ISDN2602) (when available) \[3\]
 - [ISDN2603](https://ust.space/review/ISDN2603) (Fall) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>AE/MECH</summary>
 
 - one of
@@ -186,9 +186,9 @@ Remark: don't expect good grades in ISDN, and grades won't matter for getting in
 - [MECH1907](https://ust.space/review/MECH1907) (Fall) \[3\]
 - [MECH2410](https://ust.space/review/MECH2410) (Spring) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>EVMT</summary>
 
 - [ENVR1170](https://ust.space/review/ENVR1170) (Spring) \[3\]
@@ -196,9 +196,9 @@ Remark: don't expect good grades in ISDN, and grades won't matter for getting in
 - [ENVR3310](https://ust.space/review/ENVR3310) (Spring) \[3\]
 - [ENVR3420](https://ust.space/review/ENVR3420) (Fall) \[3\]
 
-</details>
+</details markdown="1">
 
-<details>
+<details markdown="1">
 <summary>RMBI</summary>
 
 - [ACCT2010](https://ust.space/review/ACCT2010) \[3\]
@@ -212,7 +212,7 @@ Remark: don't expect good grades in ISDN, and grades won't matter for getting in
 - [MGMT2010](https://ust.space/review/MGMT2010) \[2\]
 - [MGMT2130](https://ust.space/review/MGMT2130) \[2\]
 
-</details>
+</details markdown="1">
 
 ### Additional