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

.p-splitbutton .p-splitbutton-defaultbutton {
    flex: 1 1 auto;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-right: 0 none;
}

.p-splitbutton-menubutton {
    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;
}