.p-splitbutton {
    display: inline-flex;
    position: relative;
}

.p-splitbutton .p-splitbutton-defaultbutton,
.p-splitbutton.p-button-rounded > .p-splitbutton-defaultbutton.p-button,
.p-splitbutton.p-button-outlined > .p-splitbutton-defaultbutton.p-button {
    flex: 1 1 auto;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-right: 0 none;
}

.p-splitbutton-menubutton,
.p-splitbutton.p-button-rounded > .p-splitbutton-menubutton.p-button,
.p-splitbutton.p-button-outlined > .p-splitbutton-menubutton.p-button {
    display: flex;
    align-items: center;
    justify-content: center;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.p-splitbutton .p-menu {
    min-width: 100%;
}

.p-fluid .p-splitbutton  {
    display: flex;
}