diff --git a/src/pages/projects/education.js b/src/pages/projects/education.js
index 3226c3b..915fdbf 100644
--- a/src/pages/projects/education.js
+++ b/src/pages/projects/education.js
@@ -6,11 +6,11 @@ const PhysicsPage = (props) => {
     const {data} = props;
     return(
         <Layout>
-            <ul class="nav nav-tabs">       
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/physics">Физика</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link active" to="./projects/education">Образование</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/math">Математика</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/software">Программное обеспечение</Link></li>       
+            <ul className="nav nav-tabs">       
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/physics">Физика</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link active" to="./projects/education">Образование</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/math">Математика</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/software">Программное обеспечение</Link></li>       
             </ul>
 
             <h1 style = {{marginTop: `20px`}}> Образовательные проекты </h1>
@@ -33,8 +33,8 @@ const PhysicsPage = (props) => {
                 const id = project.frontmatter.id;
                 const courseName = project.frontmatter.courseName;
                 return(
-                    <div class="row" id={id}>
-                    <div class="col-lg-12">
+                    <div className="row" id={id}>
+                    <div className="col-lg-12">
                     <hr/>
                         <h2 name={id}>{title}</h2>
                         <p
@@ -42,8 +42,8 @@ const PhysicsPage = (props) => {
                             __html: project.html,
                             }}
                         />
-                        <div class="card" style={{backgroundColor: `#F5F5F5`}}>
-                            <div class="card-body" style={{padding: `10px`}}>
+                        <div className="card" style={{backgroundColor: `#F5F5F5`}}>
+                            <div className="card-body" style={{padding: `10px`}}>
                                 <p style={{textAlign: `center`, margin: `5px`}}>
                                     Подробная информация доступна на <Link to={`./pages/${courseName}`}>странице курса</Link>
                                 </p>
diff --git a/src/pages/projects/math.js b/src/pages/projects/math.js
index d118de5..ad795eb 100644
--- a/src/pages/projects/math.js
+++ b/src/pages/projects/math.js
@@ -6,11 +6,11 @@ const PhysicsPage = (props) => {
     const {data} = props;
     return(
         <Layout>
-            <ul class="nav nav-tabs">       
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/physics">Физика</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/education">Образование</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link active" to="./projects/math">Математика</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/software">Программное обеспечение</Link></li>       
+            <ul className="nav nav-tabs">       
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/physics">Физика</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/education">Образование</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link active" to="./projects/math">Математика</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/software">Программное обеспечение</Link></li>       
             </ul>
 
             <h1 style = {{marginTop: `20px`}}> Математические методы </h1>
@@ -34,8 +34,8 @@ const PhysicsPage = (props) => {
                 const title = project.frontmatter.title;
                 const id = project.frontmatter.id;
                 return(
-                    <div class="row" id={id}>
-                    <div class="col-lg-12">
+                    <div className="row" id={id}>
+                    <div className="col-lg-12">
                     <hr/>
                         <h2 name={id}>{title}</h2>
                         <p
diff --git a/src/pages/projects/physics.js b/src/pages/projects/physics.js
index f97b290..9739e27 100644
--- a/src/pages/projects/physics.js
+++ b/src/pages/projects/physics.js
@@ -6,11 +6,11 @@ const PhysicsPage = (props) => {
     const {data} = props;
     return(
         <Layout>
-            <ul class="nav nav-tabs">       
-                <li class="nav-item"><Link id="project" class="nav-link active" to="./projects/physics">Физика</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/education">Образование</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/math">Математика</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/software">Программное обеспечение</Link></li>       
+            <ul className="nav nav-tabs">       
+                <li className="nav-item"><Link id="project" className="nav-link active" to="./projects/physics">Физика</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/education">Образование</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/math">Математика</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/software">Программное обеспечение</Link></li>       
             </ul>
 
             <h1 style = {{marginTop: `20px`}}> Ядерная физика </h1>
@@ -34,8 +34,8 @@ const PhysicsPage = (props) => {
                 const title = project.frontmatter.title;
                 const id = project.frontmatter.id;
                 return(
-                    <div class="row" id={id}>
-                    <div class="col-lg-12">
+                    <div className="row" id={id}>
+                    <div className="col-lg-12">
                     <hr/>
                         <h2 name={id}>{title}</h2>
                         <p
diff --git a/src/pages/projects/software.js b/src/pages/projects/software.js
index 0468109..47f536c 100644
--- a/src/pages/projects/software.js
+++ b/src/pages/projects/software.js
@@ -6,11 +6,11 @@ const PhysicsPage = (props) => {
     const {data} = props;
     return(
         <Layout>
-            <ul class="nav nav-tabs">       
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/physics">Физика</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/education">Образование</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link " to="./projects/math">Математика</Link></li>
-                <li class="nav-item"><Link id="project" class="nav-link active" to="./projects/software">Программное обеспечение</Link></li>       
+            <ul className="nav nav-tabs">       
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/physics">Физика</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/education">Образование</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link " to="./projects/math">Математика</Link></li>
+                <li className="nav-item"><Link id="project" className="nav-link active" to="./projects/software">Программное обеспечение</Link></li>       
             </ul>
 
             <h1 style = {{marginTop: `20px`}}> Научное программное обеспечение </h1>
@@ -34,8 +34,8 @@ const PhysicsPage = (props) => {
                 const title = project.frontmatter.title;
                 const id = project.frontmatter.id;
                 return(
-                    <div class="row" id={id}>
-                    <div class="col-lg-12">
+                    <div className="row" id={id}>
+                    <div className="col-lg-12">
                     <hr/>
                         <h2 name={id}>{title}</h2>
                         <p