.kado_maru{
    /*コレ*/border: 2px solid #2544c6;
    /*コレ*/border-radius: 20px;
    display: block;
    width: 80px;
    padding: 5px;
    box-sizing: border-box;
    background: #eaf2fc;
    color: #333;
    text-decoration: none;
    text-align: center;
    
}