画面の最大幅が固定値になっていたこと削除。

public_new/css/chat.css

@@ -332,7 +332,6 @@ input[name="tab_item"] {
   color: #fff;
   color: #fff;
   border: none;
   border: none;
   font-size: 18px;
   font-size: 18px;
-  max-width: 1280px;
 }
 }
 .select_member {
 .select_member {
   font-size: 14px;
   font-size: 14px;

public_new/css/chat_room_footer.css

@@ -2,7 +2,6 @@
 
 
 /**************************** footer *************************/
 /**************************** footer *************************/
 footer {
 footer {
-  max-width: 1280px;
   background: #F9F9F9;
   background: #F9F9F9;
   margin-top: 20px;
   margin-top: 20px;
   border-top: 1px solid #CCCCCC;
   border-top: 1px solid #CCCCCC;

public_new/css/collaboration.css

 @charset "UTF-8";
 @charset "UTF-8";
 /**************************** header *************************/
 /**************************** header *************************/
 #collabo_header {
 #collabo_header {
-  max-width: 1280px;
   height: 60px;
   height: 60px;
   position: fixed;
   position: fixed;
   top: 0;
   top: 0;
@@ -166,7 +165,6 @@
   height: 100vh;
   height: 100vh;
   z-index: 5;
   z-index: 5;
   width: 100%;
   width: 100%;
-  max-width: 1280px;
   margin: 0 auto;
   margin: 0 auto;
 }
 }
 
 
@@ -202,7 +200,6 @@
   background: white;
   background: white;
   height: 70%;
   height: 70%;
   width: 80%;
   width: 80%;
-  max-width: 1280px;
 }
 }
 #add_user_list .user_list li {
 #add_user_list .user_list li {
   list-style: none;
   list-style: none;
@@ -340,7 +337,6 @@
 
 
 /**************************** footer *************************/
 /**************************** footer *************************/
 #collabo_footer {
 #collabo_footer {
-  max-width: 1280px;
   background: #1d1d1d;
   background: #1d1d1d;
   height: 120px;
   height: 120px;
   margin-top: 20px;
   margin-top: 20px;
@@ -368,7 +364,6 @@
 /**************************** footer-menu *************************/
 /**************************** footer-menu *************************/
 #collabo_footer_menu {
 #collabo_footer_menu {
   transition: 0.7s;
   transition: 0.7s;
-  max-width: 1280px;
   height: 70px;
   height: 70px;
   position: fixed;
   position: fixed;
   width: 100%;
   width: 100%;
@@ -785,7 +780,6 @@ input[name="tab_item"] {
   color: #fff;
   color: #fff;
   border: none;
   border: none;
   font-size: 18px;
   font-size: 18px;
-  max-width: 1280px;
 }
 }
 .modal-content .select_member {
 .modal-content .select_member {
   font-size: 14px;
   font-size: 14px;
@@ -877,7 +871,6 @@ input[name="tab_item"] {
   color: #fff;
   color: #fff;
   border: none;
   border: none;
   font-size: 18px;
   font-size: 18px;
-  max-width: 1280px;
 }
 }
 
 
 .pip_indicator {
 .pip_indicator {

public_new/css/common.css

@@ -2,7 +2,6 @@
 @import url(./notosansjp.css);
 @import url(./notosansjp.css);
 
 
 body {
 body {
-  max-width: 1280px;
   font-family: "Noto Sans JP", sans-serif;
   font-family: "Noto Sans JP", sans-serif;
   margin: 0 auto;
   margin: 0 auto;
   color: #323743;
   color: #323743;
@@ -20,7 +19,6 @@ a:link {
 }
 }
 /**************************** nav *************************/
 /**************************** nav *************************/
 nav {
 nav {
-  max-width: 1280px;
   height: 60px;
   height: 60px;
   position: fixed;
   position: fixed;
   top: 0;
   top: 0;

public_new/css/footer.css

@@ -2,7 +2,6 @@
 
 
 /**************************** footer *************************/
 /**************************** footer *************************/
 footer {
 footer {
-  max-width: 1280px;
   background: #f9f9f9;
   background: #f9f9f9;
   height: 70px;
   height: 70px;
   margin-top: 20px;
   margin-top: 20px;