Added icons.

dollarsign.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="31.999998"
+   height="31.999998"
+   viewBox="0 0 8.4666661 8.4666661"
+   version="1.1"
+   id="svg1"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <g
+     id="layer1">
+    <path
+       style="font-size:7.05556px;font-family:Iosevka;-inkscape-font-specification:'Iosevka, Normal';fill:#ffffff;stroke:#323232;stroke-width:0.3;paint-order:markers stroke fill"
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+       id="text1"
+       aria-label="$" />
+  </g>
+</svg>

lambda.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="31.999998"
+   height="31.999998"
+   viewBox="0 0 8.4666661 8.4666661"
+   version="1.1"
+   id="svg1"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <g
+     id="layer1">
+    <path
+       d="M 3.4007773,6.8262472 H 2.8292769 L 3.9511109,3.0515226 3.7888331,2.4941333 Q 3.725333,2.2824665 3.661833,2.0707997 3.5983329,1.8520773 3.5348329,1.6404105 H 4.1063333 L 5.6373898,6.8262472 H 5.0658894 L 4.2403889,3.7923564 Z"
+       id="text1"
+       style="font-size:7.05556px;font-family:Iosevka;-inkscape-font-specification:'Iosevka, Normal';fill:#d499ff;stroke:#323232;stroke-width:0.4;paint-order:markers stroke fill"
+       aria-label="λ" />
+  </g>
+</svg>

prompt.svg

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="31.999998"
+   height="31.999998"
+   viewBox="0 0 8.4666661 8.4666661"
+   version="1.1"
+   id="svg1"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <g
+     id="layer1">
+    <path
+       style="font-size:7.05556px;font-family:Iosevka;-inkscape-font-specification:'Iosevka, Normal';fill:#ffffff;stroke:#323232;stroke-width:0.3;paint-order:markers stroke fill"
+       d="M 1.3581962,5.5068568 1.0900849,5.1117454 3.397253,3.6935778 1.0900849,2.2754102 1.3581962,1.8802989 3.8488089,3.418411 V 3.9687447 Z M 7.3765889,6.5863575 H 4.7519206 V 6.0924683 h 2.6246683 z"
+       id="text1"
+       aria-label="&gt;_" />
+  </g>
+</svg>

question.svg

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="31.999998"
+   height="31.999998"
+   viewBox="0 0 8.4666661 8.4666661"
+   version="1.1"
+   id="svg1"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <g
+     id="layer1">
+    <path
+       d="m 3.9652249,5.2669751 q 0,-0.1693334 0.014111,-0.3386669 0.014111,-0.1693334 0.056445,-0.3316113 0.049389,-0.1693334 0.1340556,-0.3175002 0.084667,-0.1552223 0.1834446,-0.289278 0.1058334,-0.1411112 0.2187224,-0.2681113 0.1128889,-0.127 0.2116668,-0.2681112 0.098778,-0.1411112 0.1552223,-0.3033891 0.0635,-0.1622779 0.0635,-0.3316114 0,-0.1481667 -0.056445,-0.2963335 Q 4.8965588,2.3741955 4.7836699,2.2754176 4.6778365,2.1695842 4.5296697,2.1272509 4.3815029,2.0778619 4.2333362,2.0778619 q -0.1552224,0 -0.3104447,0.049389 Q 3.7747248,2.1766398 3.6688914,2.2965843 3.563058,2.4094733 3.513669,2.5646956 3.4642801,2.7128623 3.4642801,2.8680847 V 2.910418 H 2.9139464 v -0.0635 q 0,-0.176389 0.035278,-0.3457225 Q 2.9915576,2.3318621 3.0691688,2.1836953 3.1538355,2.028473 3.2808356,1.9085285 3.4078356,1.788584 3.563058,1.7180284 3.7182803,1.6404172 3.8876137,1.612195 4.0640027,1.583973 4.2333362,1.583973 q 0.1693334,0 0.3386669,0.028222 0.1693334,0.028222 0.3245557,0.098778 0.1552223,0.070556 0.2822224,0.1905001 0.1270001,0.112889 0.2116668,0.2610558 0.084667,0.1481667 0.1199446,0.3175002 0.042333,0.1693334 0.042333,0.3386668 0,0.1693335 -0.042333,0.3386669 Q 5.4751148,3.3266961 5.4045591,3.4819184 5.3410591,3.6371407 5.2493368,3.7853075 5.1576145,3.9264187 5.0517811,4.0604743 4.9459477,4.19453 4.8330588,4.3285856 4.7201698,4.4555857 4.6425587,4.610808 4.5649475,4.7589748 4.5367253,4.9283082 4.5155586,5.0976417 4.5155586,5.2669751 Z m 0.2751668,1.6157233 q -0.098778,0 -0.1975557,-0.028222 Q 3.9440582,6.8262539 3.8735026,6.7556983 3.802947,6.6780871 3.7747248,6.5863648 3.7465025,6.487587 3.7465025,6.3817536 q 0,-0.098778 0.028222,-0.1905001 0.028222,-0.098778 0.098778,-0.1693335 0.070556,-0.077611 0.1693334,-0.1058334 0.098778,-0.028222 0.1975557,-0.028222 0.098778,0 0.1975557,0.028222 0.098778,0.028222 0.1693335,0.1058334 0.070556,0.070556 0.098778,0.1693335 0.035278,0.091722 0.035278,0.1905001 0,0.1058334 -0.035278,0.2046112 -0.028222,0.091722 -0.098778,0.1693335 -0.070556,0.070556 -0.1693335,0.098778 -0.098778,0.028222 -0.1975556,0.028222 z"
+       id="text1"
+       style="font-size:7.05556px;font-family:Iosevka;-inkscape-font-specification:'Iosevka, Normal';fill:#ffe099;stroke:#323232;stroke-width:0.4;paint-order:markers stroke fill"
+       aria-label="?" />
+  </g>
+</svg>

sigma.svg

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="31.999998"
+   height="31.999998"
+   viewBox="0 0 8.4666661 8.4666661"
+   version="1.1"
+   id="svg1"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <g
+     id="layer1">
+    <path
+       d="M 2.9209992,6.8262472 V 6.332358 L 3.9863887,4.2298011 2.9209992,2.1342997 V 1.6404105 H 5.5456675 V 2.1342997 H 3.4713329 L 4.5367224,4.2298011 3.4713329,6.332358 h 2.0743346 v 0.4938892 z"
+       id="text1"
+       style="font-size:7.05556px;font-family:Iosevka;-inkscape-font-specification:'Iosevka, Normal';fill:#ffa499;stroke:#323232;stroke-width:0.4;paint-order:markers stroke fill"
+       aria-label="Σ" />
+  </g>
+</svg>