html, 

body {
  display: flex;
  justify-content: left;
  align-items: left; height:7vh; background-color: #0c9107;
  margin: 400; 
}  
.container {
  border-radius: 5px;
  cursor: pointer;
  font-size:10px;
  transition: 0.3s;
  background-color:#fadd02 ;
}
.container-hover {
  background-color: #fffffc;
  
}

canvas {
  display: block;
  margin: auto;
}

nav {
  font-size: 10px;
  text-align: center;
  font-weight: bold;
  color: #fcfbf7;
  font-family: "Roboto", sans-serif;  
}
h1 {
  background-color: white;
  font-size: 50px;
  text-align: center;
  color: #0431b8;
  font-family: "Roboto", sans-serif;
}

h2 {
  background-color: white;
  font-size: 20px;
  text-align: center;
  color: #0431b8;
  font-family: "Roboto", sans-serif;  
}

button {
  border-radius:5px;
  padding: 10px;
  background-color: white;
  color:#0431b8 ;
  font-size: 20px;
  font-weight: bold;

}

#button-holder {
  padding-top: 30px;
  padding-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  width: 600px;
  margin: auto;
  justify-content: center;
}