Clean up CSS, minor design changes

1 files changed, 3 insertions, 3 deletions

diff --git a/content/know/concept/quantum-gate/index.pdc b/content/know/concept/quantum-gate/index.pdc
index 189145f..b9682ec 100644
--- a/content/know/concept/quantum-gate/index.pdc
+++ b/content/know/concept/quantum-gate/index.pdc
@@ -209,7 +209,7 @@ With that said, the first two-qubit gate is $\mathrm{SWAP}$,
 which simply swaps $\ket{\psi_1}$ and $\ket{\psi_2}$:
 
 <a href="swap.png">
-<img src="swap.png" style="width:22%;display:block;margin:auto;">
+<img src="swap.png" style="width:22%">
 </a>
 
 $$\begin{aligned}
@@ -238,7 +238,7 @@ Next, there is the **controlled NOT gate** $\mathrm{CNOT}$,
 which "flips" (applies $X$ to) $\ket{\psi_2}$ if $\ket{\psi_1}$ is true:
 
 <a href="cnot.png">
-<img src="cnot.png" style="width:22%;display:block;margin:auto;">
+<img src="cnot.png" style="width:22%">
 </a>
 
 $$\begin{aligned}
@@ -265,7 +265,7 @@ we can define a two-qubit **controlled U gate** $\mathrm{CU}$,
 which applies $U$ to $\ket{\psi_2}$ if $\ket{\psi_1}$ is true:
 
 <a href="cu.png">
-<img src="cu.png" style="width:22%;display:block;margin:auto;">
+<img src="cu.png" style="width:22%">
 </a>
 
 $$\begin{aligned}