.top_img {
    margin:20px auto;
}
.top_img img {
    width: 100%;
}
.calculator {
    text-align: center;
}
.calculator label{
    margin: 20px 0 30px;
    font-size: 24px;
}
.calculator select#birthYear {
    padding: 3px 20px 3px 10px;
}
.graduate-table {
    width: 90%;
    margin: 30px auto 100px;
}
.graduate-table tbody {
    display: flex;
}
.graduate-table tbody tr {
    display: flex;
    flex-direction: column;
    width: calc(100% / 5);
    height:140px;
    border: 1px solid #ccc;
    border-right: none;
}
.graduate-table tbody tr:last-child{
    border-right: 1px solid #ccc;
}
.graduate-table tbody tr th,
.graduate-table tbody tr td{
    font-size:18px;
    line-height: 1.2;
    padding: 15px 10px;
    height:50%;
}
.graduate-table tbody tr th{
    background: #236de9;
    color:#fff;
    font-weight: bold;
}
.graduate-table tbody tr:nth-child(1) th,
.graduate-table tbody tr:nth-child(4) th,
.graduate-table tbody tr:nth-child(5) th{
    line-height: 2.1;
}
.graduate-table tbody tr td{
    background: #fff;
}
@media (max-width: 599px){
    .calculator label {
        margin: 10px 0 50px;
        font-size: 20px;
    }
    .graduate-table tbody{
        display:block;
    }
     .graduate-table tbody tr{
        justify-content: space-between;
        flex-direction: row;
        width:100%;
        height: 75px;
        border: 1px solid #ccc;
        border-bottom: none;
    }
    .graduate-table tbody tr:last-child{
        border-bottom: 1px solid #ccc;
    }
    .graduate-table tbody tr th{
        width:40%;
        height: 100%;
    }
    .graduate-table tbody tr:nth-child(1) th,
    .graduate-table tbody tr:nth-child(4) th,
    .graduate-table tbody tr:nth-child(5) th {
        line-height: 2.4;
    }
    .graduate-table tbody tr td{
        width:60%;
    }
    
}