#content-birthday {
    position: relative;
    margin-top: 12px;
    padding-right: 218px;
    box-sizing: border-box;
}
.combobox-wrapper {
    position: relative;
    display: inline-block;
}
.combobox-wrapper:after {
    content: '';
    position: absolute;
    height: 0;
    width: 0;
    top: 19px;
    right: 15px;
    border-width: 6px 5px 0;
    border-style: solid;
    border-color: #c4d4dc #fff;
    cursor: pointer;
}
.combobox-wrapper > select {
    display: inline-block;
    height: 40px;
    width: 100%;
    padding: 0 28px 0 15px;
    border: 1px solid #c4d4dc;
    box-sizing: border-box;
    background-color: #fff;
    font-size: 14px;
    color: #414141;
    line-height: 38px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
       -moz-appearance: none;
}
.combobox-wrapper > select > option {
    height: 40px;
    padding: 10px 0 10px 15px;
    box-sizing: border-box;
    font-size: 14px;
    color: #414141;
}
#combobox-month {
    width: 100%;
}
#combobox-day {
    position: absolute;
    width: 70px;
    top: 0;
    right: 138px;
}
#combobox-year {
    position: absolute;
    width: 128px;
    top: 0;
    right: 0;
}
#content-page-content-birthday > .content-page-content-item,
#content-birthday {
    padding-right: 218px;
}

@media screen and (max-width: 900px) {
    #content-page-content-birthday > .content-page-content-item,
    #content-birthday {
        padding-right: 175px;
    }
    #combobox-year {
        width: 85px;
    }
    #combobox-day {
        right: 95px;
    }
}

@media screen and (max-width: 380px) {
    .combobox-wrapper > select {
        padding-left: 10px;
    }
}