h1{
    text-align: center;
    border : 2px solid black;
    min-height: 50px;
    background-color: lightgray;
    padding-top: 20px;
  }
  
.memo{
    border : 2px solid black;
    background-color: lightgray;
    margin-top : 20px;
    padding: 10px;
  }
  
  
.attention{
    display: block;
    padding-top: 10px;
    padding-bottom: 10px;
    color : red;
    font-size: 1.5em;
    font-weight: bold;
    text-align: center;
  }
  
h2{
    background-color: lightgray;
    padding-left:20px;
    padding-top: 5px;
    padding-bottom: 5px;
  }
  
h3{
  padding-left:10px;
    color:rgb(33, 109, 250);
}

h4{
    color:red;
}

table {
    width: 50%;
    border: 2px solid black;
  }

td {
    border: 2px solid black;
    text-align: center;
  }

th {
    background:lightgrey;
    border: 2px solid black;
    text-align: center;
}
  
img{
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-width: 600px;
  }