diff --git a/docs/_static/package-slices.svg b/docs/_static/package-slices.svg
index 32a879f57..bc1f37909 100644
--- a/docs/_static/package-slices.svg
+++ b/docs/_static/package-slices.svg
@@ -6,22 +6,22 @@
 <rect x="0" y="0" width="480" height="360" fill="none" />
 
 <g transform="translate(0, 0)">
-<rect x="10" y="10" width="420" height="150" stroke="black" fill="#c0c0c0" />
+<rect x="10" y="10" width="420" height="150" stroke="currentColor" fill="#c0c0c0" />
 
 <text x="220" y="35" font-family="Ubuntu" font-size="18"
 	  text-anchor="middle" dominant-baseline="text-after-edge"
-      fill="black">Debian package A</text>
+      fill="currentColor">Debian package A</text>
 
-<rect x="20" y="52" width="160" height="95" stroke="black" fill="none"
+<rect x="20" y="52" width="160" height="95" stroke="currentColor" fill="none"
 	  stroke-dasharray="3,2" />
 <text x="100" y="107" font-family="Ubuntu" font-size="15"
 	  text-anchor="middle" dominant-baseline="text-after-edge"
-      fill="black">A_slice1</text>
-<rect x="150" y="45" width="160" height="95" stroke="black" fill="none"
+      fill="currentColor">A_slice1</text>
+<rect x="150" y="45" width="160" height="95" stroke="currentColor" fill="none"
 	  stroke-dasharray="3,2" />
 <text x="230" y="100" font-family="Ubuntu" font-size="15"
 	  text-anchor="middle" dominant-baseline="text-after-edge"
-      fill="black">A_slice2</text>
+      fill="currentColor">A_slice2</text>
 <rect x="320" y="45" width="90" height="95" stroke="#505050" fill="none"
 	  stroke-dasharray="3,2" />
 <text x="365" y="100" font-family="Ubuntu" font-size="15"
@@ -30,37 +30,37 @@
 </g>
 
 <g transform="translate(40, 220)">
-<rect x="10" y="10" width="380" height="120" stroke="black" fill="#c0c0c0" />
+<rect x="10" y="10" width="380" height="120" stroke="currentColor" fill="#c0c0c0" />
 
 <text x="200" y="125" font-family="Ubuntu" font-size="18"
 	  text-anchor="middle" dominant-baseline="text-after-edge"
-      fill="black">Debian package B</text>
+      fill="currentColor">Debian package B</text>
 
-<rect x="20" y="20" width="140" height="75" stroke="black" fill="none"
+<rect x="20" y="20" width="140" height="75" stroke="currentColor" fill="none"
 	  stroke-dasharray="3,2" />
 <text x="90" y="65" font-family="Ubuntu" font-size="15"
 	  text-anchor="middle" dominant-baseline="text-after-edge"
-      fill="black">B_slice1</text>
+      fill="currentColor">B_slice1</text>
 
-<rect x="170" y="20" width="210" height="75" stroke="black" fill="none"
+<rect x="170" y="20" width="210" height="75" stroke="currentColor" fill="none"
 	  stroke-dasharray="3,2" />
 <text x="275" y="65" font-family="Ubuntu" font-size="15"
 	  text-anchor="middle" dominant-baseline="text-after-edge"
-      fill="black">B_slice2</text>
+      fill="currentColor">B_slice2</text>
 
-<path d="M 60,20 l 0,-85" stroke="black" fill="none"
+<path d="M 60,20 l 0,-85" stroke="currentColor" fill="none"
       stroke-dasharray="3,2" />
-<path d="M 60,-73 l 4,8 -8,0 z" stroke="black" fill="none" />
+<path d="M 60,-73 l 4,8 -8,0 z" stroke="currentColor" fill="none" />
 
-<path d="M 190,20 c 0,-73 -110,-20 -110,-85" stroke="black" fill="none"
+<path d="M 190,20 c 0,-73 -110,-20 -110,-85" stroke="currentColor" fill="none"
       stroke-dasharray="3,2" />
-<path d="M 80,-73 l 4,8 -8,0 z" stroke="black" fill="none" />
+<path d="M 80,-73 l 4,8 -8,0 z" stroke="currentColor" fill="none" />
 
-<path d="M 230,20 l 0,-92" stroke="black" fill="none"
+<path d="M 230,20 l 0,-92" stroke="currentColor" fill="none"
       stroke-dasharray="3,2" />
-<path d="M 230,-80 l 4,8 -8,0 z" stroke="black" fill="none" />
+<path d="M 230,-80 l 4,8 -8,0 z" stroke="currentColor" fill="none" />
 
-<path d="M 390,35 c 50,-20 60,-75 7,-105" stroke="black" fill="none" />
-<path d="M 397,-70 l 2,-3 -8,-1 4,7 z" stroke="black" fill="none" />
+<path d="M 390,35 c 50,-20 60,-75 7,-105" stroke="currentColor" fill="none" />
+<path d="M 397,-70 l 2,-3 -8,-1 4,7 z" stroke="currentColor" fill="none" />
 </g>
 </svg>
diff --git a/docs/tutorial/flask.rst b/docs/tutorial/flask.rst
index fec53e20b..c2fb9400a 100644
--- a/docs/tutorial/flask.rst
+++ b/docs/tutorial/flask.rst
@@ -463,8 +463,8 @@ Finally, use ``curl`` to send a request to the ``/time`` endpoint:
     :end-before: [docs:curl-time-end]
     :dedent: 2
 
-The updated app should respond with the current date and time (e.g.
-``2024-06-21 09:47:56``).
+The updated app should respond with the current date and time in
+UTC (e.g. ``2024-06-21 09:47:56``).
 
 .. note::