.corner-image {
  position: fixed;
  bottom: 10px;
  right: 10px;
  width: 50px;
  height: auto;
}
.corner-button {
  text-decoration:none;
  padding: 5px;
  text-align: center;
  border-radius: 7px;
  position: fixed;
  color:#2A3860;
  bottom: 10px;
  left: 10px;
  width: auto;
  height: auto;
  background-color: #E3F0F9; 
  border: 5px solid #2A3860;
}
.button{
display: block;
box-sizing: border-box;
font-size: 200%;
padding: 10px;
color:#2A3860;
width:100%;
text-decoration:none;
text-align: center;
background-color: #E3F0F9; 
border-bottom: 5px solid #2A3860;
}
.button2{
display: block;
border-radius: 10px;
box-sizing: border-box;
font-size: 30px;
padding: 10px;
color:#2A3860;
width:auto;
text-decoration:none;
text-align: center;
background-color: #E3F0F9; 
border: 5px solid #2A3860;
}
.container {
  display: grid;
  gap: 15px;
  grid-template-columns: 1fr 3fr;
  grid-template-areas:
  "header header"
  "sidebar content"
  "footer footer"
}

#header {
grid-area: header;
  padding: 2px;
text-align: center;
border-radius: 10px;
background-color: lightskyblue; 
  background-image: url(star.png);
  background-position: center; 
  background-repeat: no-repeat; 
  background-size: cover; 
border: 5px solid #2A3860;
}

#sidebar {
grid-area: sidebar;
  padding: 10px;
  overflow: hidden;
height: auto;
border-radius: 10px;
background-color: #E3F0F9;
border: 5px solid #2A3860;
}

#content {
  background-image: url(bubbles.png);
  background-position: right; 
  background-repeat: no-repeat; 
  background-size: cover; 
grid-area: content;
  padding: 10px;
  border-radius: 10px;
min-height: 700px;
height: auto;
background-color: #E3F0F9;
border: 5px solid #2A3860;
}

#footer {
    padding: 10px;
    border-radius: 10px;
grid-area: footer;
background-color: #E3F0F9;
border: 5px solid #2A3860;
}