body {
  margin: 0;
  padding: 20px;
    font-size: 25px;
}

header {
  background-color: #2c3e50;
  color: white;
  text-align: center;
  padding: 20px 10px;
  }

header h1 {
 font-size: 2.5em;
}

main {
  padding: 20px;
  
}

main {
  border: 2px solid #333;         
  border-radius: 15px;           
  padding: 20px;                  
  background-color: #f5f5f5;     
  width: fit-content;             
  margin: 20px auto;             
 line-height: 2;
}
 
.ww {
text-align: center;
}

return-top {
  text-align: center;
  margin-top: 30px;
}

.return-top a{
  color: #3498db;
text-decoration: none;
 font-weight: bold;
}

.return-top a:hover {
  text-decoration: underline;
}

footer {
  background-color: #000000
  color: black;
  text-align: center;
  padding: 10px;
   }

/* solid001 */
.button_solid001 {
  display: flex;
  justify-content: center;   
  gap: 10px;   
  flex-wrap: wrap; 
  padding: 10px;
}

.button_solid001 a {
  display: inline-flex; 
  justify-content: center;
  align-items: center;
  padding: 10px 25px;
  color: white;
  font-weight: 600;
  background: #2c3e50;
  filter: drop-shadow(0px 2px 4px #ccc);
  border-radius: 3px;
  text-decoration: none;
  transition: 0.3s ease-in-out;
}

.button_solid001 a:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px rgb(0 0 0 / 15%), 0 0 5px rgb(0 0 0 / 10%);
}

@media screen and (max-width: 600px) {
  body {
    padding: 10px;
  }

  header, main, footer {
    padding-left: 10px;
    padding-right: 10px;
  }