.buttons {
    display: flex;
}

.buttons > div {
    float: left;
}

.buttons div button {
    width: 100%;
}
.input-group-text {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    padding: .375rem .75rem;
    margin-bottom: 0;
    font-weight: 400;
    line-height: 1.5;
    color: #495057;
    text-align: center;
    white-space: nowrap;
}

.date-range-separator {
    text-align: center;
    padding-top: 10px;
    margin-left: -7px;
}

.date-range-group {
    display: flex;
}

    .date-range-group > div:last-child {
        margin-left: -6px;
        padding-right: 16px;
    }