diff --git a/src/ui/player/player.sass b/src/ui/player/player.sass
deleted file mode 100644
index ce83236..0000000
--- a/src/ui/player/player.sass
+++ /dev/null
@@ -1,28 +0,0 @@
-body
-  background-color: #131313
-
-html, body, video
-  width: 100%
-  height: 100%
-  margin: 0
-
-video
-  position: absolute
-  top: 0
-  left: 0
-
-#message-container
-  visibility: hidden
-  display: flex
-  justify-content: center
-  align-items: center
-  flex-direction: column
-  color: white
-  text-align: center
-  height: 100%
-
-  & *
-    visibility: inherit
-
-  & a, & a:visited
-    color: red
diff --git a/src/ui/player/player.scss b/src/ui/player/player.scss
new file mode 100644
index 0000000..1675fd6
--- /dev/null
+++ b/src/ui/player/player.scss
@@ -0,0 +1,34 @@
+body {
+  background-color: #131313;
+}
+
+html, body, video {
+  width: 100%;
+  height: 100%;
+  margin: 0;
+}
+
+video {
+  position: absolute;
+  top: 0;
+  left: 0;
+}
+
+#message-container {
+  visibility: hidden;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  flex-direction: column;
+  color: white;
+  text-align: center;
+  height: 100%;
+
+  & * {
+    visibility: inherit;
+  }
+
+  & a, & a:visited {
+    color: red
+  }
+}
diff --git a/src/ui/popup/popup.sass b/src/ui/popup/popup.sass
deleted file mode 100644
index 91641f2..0000000
--- a/src/ui/popup/popup.sass
+++ /dev/null
@@ -1,56 +0,0 @@
-body
-  background-color: #2b2a33
-  font-weight: bold
-  max-height: 500px
-  overflow-x: hidden
-  overflow-y: auto
-
-a, p
-  color: white
-  font-size: 16px
-  margin: 5px 0
-  cursor: default
-
-a
-  border: 1px solid #281515
-  cursor: pointer
-  font-weight: normal
-  padding: 5px 8px
-
-  &.active
-    background-color: rgba(255, 65, 65, 0.74)
-    cursor: default
-
-  &.disabled
-    background-color: grey
-    cursor: not-allowed
-
-  &#error
-    border: none
-    display: block
-    font-weight: lighter
-    font-size: 0.8rem
-    text-align: center
-    padding: 10px 0 5px 0
-
-hr
-  margin: 3px 0
-
-
-#all
-  display: flex
-  justify-content: center
-  margin: 10px 0
-
-
-.low-reliability
-  text-decoration: underline
-  text-decoration-color: rgb(255, 0, 0)
-
-.normal-reliability
-  text-decoration: underline
-  text-decoration-color: yellow
-
-.high-reliability
-  text-decoration: underline
-  text-decoration-color: #00ff00
diff --git a/src/ui/popup/popup.scss b/src/ui/popup/popup.scss
new file mode 100644
index 0000000..f578333
--- /dev/null
+++ b/src/ui/popup/popup.scss
@@ -0,0 +1,66 @@
+body {
+  background-color: #2b2a33;
+  font-weight: bold;
+  max-height: 500px;
+  overflow-x: hidden;
+  overflow-y: auto;
+}
+
+a, p {
+  color: white;
+  font-size: 16px;
+  margin: 5px 0;
+  cursor: default;
+}
+
+a {
+  border: 1px solid #281515;
+  cursor: pointer;
+  font-weight: normal;
+  padding: 5px 8px;
+
+  &.active {
+    background-color: rgba(255, 65, 65, 0.74);
+    cursor: default;
+  }
+
+  &.disabled {
+    background-color: grey;
+    cursor: not-allowed;
+  }
+
+  &#error {
+    border: none;
+    display: block;
+    font-weight: lighter;
+    font-size: 0.8rem;
+    text-align: center;
+    padding: 10px 0 5px 0;
+  }
+
+}
+
+hr {
+  margin: 3px 0;
+}
+
+#all {
+  display: flex;
+  justify-content: center;
+  margin: 10px 0
+}
+
+.low-reliability {
+  text-decoration: underline;
+  text-decoration-color: rgb(255, 0, 0);
+}
+
+.normal-reliability {
+  text-decoration: underline;
+  text-decoration-color: yellow;
+}
+
+.high-reliability {
+  text-decoration: underline;
+  text-decoration-color: #00ff00;
+}
diff --git a/tasks/build.ts b/tasks/build.ts
index b5db602..5e963e2 100644
--- a/tasks/build.ts
+++ b/tasks/build.ts
@@ -47,8 +47,8 @@ async function buildHtml() {
 
 async function buildCss() {
     const files = {
-        'src/ui/popup/popup.sass': 'build/ui/popup/popup.css',
-        'src/ui/player/player.sass': 'build/ui/player/player.css'
+        'src/ui/popup/popup.scss': 'build/ui/popup/popup.css',
+        'src/ui/player/player.scss': 'build/ui/player/player.css'
     }
 
     for (const [src, dst] of Object.entries(files)) {