diff --git a/sd-card/html/edit_explain_0.html b/sd-card/html/edit_explain_0.html
index 338797b9..c90bff3c 100644
--- a/sd-card/html/edit_explain_0.html
+++ b/sd-card/html/edit_explain_0.html
@@ -7,9 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
-
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}
 h3 {font-size: 1.2em;}
diff --git a/sd-card/html/edit_explain_6.html b/sd-card/html/edit_explain_6.html
index 76eb7dda..fbe8b212 100644
--- a/sd-card/html/edit_explain_6.html
+++ b/sd-card/html/edit_explain_6.html
@@ -7,9 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
-
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}
 h3 {font-size: 1.2em;}
diff --git a/sd-card/html/explain_0.html b/sd-card/html/explain_0.html
index 6fffd760..fc10bba7 100644
--- a/sd-card/html/explain_0.html
+++ b/sd-card/html/explain_0.html
@@ -7,9 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
-
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}
 h3 {font-size: 1.2em;}
diff --git a/sd-card/html/explain_1.html b/sd-card/html/explain_1.html
index aca2e4fa..ddc1a803 100644
--- a/sd-card/html/explain_1.html
+++ b/sd-card/html/explain_1.html
@@ -7,8 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
 
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}
diff --git a/sd-card/html/explain_2.html b/sd-card/html/explain_2.html
index b9ff2db9..5caf2a4e 100644
--- a/sd-card/html/explain_2.html
+++ b/sd-card/html/explain_2.html
@@ -7,9 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
-
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}
 h3 {font-size: 1.2em;}
diff --git a/sd-card/html/explain_3.html b/sd-card/html/explain_3.html
index e2ecdb13..de487db1 100644
--- a/sd-card/html/explain_3.html
+++ b/sd-card/html/explain_3.html
@@ -7,8 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
 
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}
diff --git a/sd-card/html/explain_4.html b/sd-card/html/explain_4.html
index 9acd902e..794019f9 100644
--- a/sd-card/html/explain_4.html
+++ b/sd-card/html/explain_4.html
@@ -7,9 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
-
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}
 h3 {font-size: 1.2em;}
diff --git a/sd-card/html/explain_5.html b/sd-card/html/explain_5.html
index aa96ea29..7dcc8e4a 100644
--- a/sd-card/html/explain_5.html
+++ b/sd-card/html/explain_5.html
@@ -7,9 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
-
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}
 h3 {font-size: 1.2em;}
diff --git a/sd-card/html/explain_6.html b/sd-card/html/explain_6.html
index 69dd05d6..edcc34f0 100644
--- a/sd-card/html/explain_6.html
+++ b/sd-card/html/explain_6.html
@@ -7,8 +7,6 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <style>
-.h_iframe iframe {width:995px;height:605px;}
-.h_iframe {width:995px;height:605px;}
 
 h1 {font-size: 2em; margin-block-end: 0.3em;}
 h2 {font-size: 1.5em;margin-block-start: 0.3em;}