Slides/exercise fractures

slides/fractures.md

@@ -61,11 +61,14 @@ Geothermal energy production
 
 ## Problem Formulation
 :::::: {.columns}
-::: {.column width=30%}
-<img src=img/fractures_modeldomain.png>
+::: {.column width=33%}
+<div style="display: flex; align-items: center; height: 100%;">
+  <img src=img/fractures_modeldomain.png>
+</div>
 :::
-::: {.column width=65%}
+::: {.column width=67%}
 $$
+\small
 \begin{aligned}
     \mathbf{u}_i &= - \mathbf{K}_i \nabla p_i, \\
     \nabla \cdot \mathbf{u}_i &= q_i, &&\mathrm{in} \, \Omega_i, \\