btpxpress-frontend/public/theme/extensions/_calendar.scss

.p-calendar-w-btn {
    border: $inputBorder;
    background: $inputBg;
    border-radius: $borderRadius;
    transition: $formElementTransition;

    .p-inputtext {
        background-image: none;
        background-color: transparent;
        border: 0 none;

        &:enabled:focus {
            box-shadow: none;
        }
    }

    .p-datepicker-trigger.p-button {
        background-color: transparent;
        border: 0 none;
    
        span {
            color: $inputIconColor;
        }

        &:enabled:hover {
            background: rgba($overlayColor, .04);
        }

        &:enabled:active,
        &:focus {
            background: rgba($overlayColor, .12);
        }

        &:disabled {
            background-color: transparent !important;
        }
    }

    &:not(.p-calendar-disabled):hover {
        border-color: $inputHoverBorderColor;
    }

    &:not(.p-calendar-disabled).p-inputwrapper-focus {
        border-color: $inputFocusBorderColor;
        box-shadow: inset 0 0 0 1px $inputFocusBorderColor,inset 0 0 0 1px $inputFocusBorderColor,inset 0 0 0 1px $inputFocusBorderColor,inset 0 0 0 1px $inputFocusBorderColor;
    }

    &.p-calendar-disabled {
        opacity: $disabledOpacity;

        .p-inputtext {
            opacity: 1;   
        }
    }
}

.p-datepicker {
    .p-datepicker-header {
        border-bottom: 0 none;

        .p-datepicker-title {
            margin: 0 auto 0 0;
            order: 1;

            .p-datepicker-year:focus,
            .p-datepicker-month:focus {
                background: $emphasis-lower;
            }
        }
    
        .p-datepicker-prev {
            order: 2;
        }
    
        .p-datepicker-next {
            order: 3;
        }

        .p-datepicker-prev:focus,
        .p-datepicker-next:focus {
            background: $emphasis-lower;
        }
    }

    table {
        th {
            border-bottom: $calendarHeaderBorder;
            color: $emphasis-low();
            font-weight: 400;
            font-size: .875rem;
        }


        td {
            > span {
                &:focus {
                    background: $emphasis-lower;
                }
            }

            &.p-datepicker-today {
                > span {
                    box-shadow: 0 0 0 1px rgba($overlayColor,.38);
                }

                &.p-highlight {
                    box-shadow: 0 0 0 1px $highlightBg;
                }
            }
        }
    }
}

.p-calendar.p-invalid {
    .p-inputtext {
        &:enabled:focus {
            box-shadow: inset 0 0 0 1px $inputErrorBorderColor,inset 0 0 0 1px $inputErrorBorderColor,inset 0 0 0 1px $inputErrorBorderColor,inset 0 0 0 1px $inputErrorBorderColor;
        }
    }

    &.p-calendar-w-btn {
        border-color: $inputErrorBorderColor;

        .p-inputtext {
            &:enabled:focus {
                box-shadow: none;
            }
        }

        &:not(.p-disabled).p-inputwrapper-focus {
            box-shadow: inset 0 0 0 1px $inputErrorBorderColor,inset 0 0 0 1px $inputErrorBorderColor,inset 0 0 0 1px $inputErrorBorderColor,inset 0 0 0 1px $inputErrorBorderColor;
        }
    }
}

.p-input-filled {
    .p-calendar-w-btn {
        @include filled-input-wrapper-default();

        &:not(.p-calendar-disabled) {
            @include filled-input-wrapper-interaction();
        }

        .p-inputtext {
            border: 0 none;
        }
    }

    .p-calendar.p-invalid {
        .p-inputtext {
            @include invalid-filled-input();
        }

        &.p-calendar-w-btn {
            @include invalid-filled-input-wrapper();

            .p-inputtext {
                border: 0 none;
                background-image: none;
            }
        }
    }
}