body {
    min-height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;  /* 가로 */
    align-items: center;
          /* 세로 */
}
main{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0px;
}
a{
    text-decoration: none;
    color: black;
}
main > div{
    min-width: 1200px;
    margin-top: 10px;
    padding: 5px;
    border: 1px solid black;
}
.title{
    
}