Thank you for pointing me in the right direction! This is what I did:
@media (max-width: 767px) {
.et-toggle-mob-sidebars-inner.et-content-left .et-toggle span.et_b-icon::after {
content: ‘FILTERS’ !important;
padding: 0.75rem 0.2rem;
writing-mode: vertical-rl; /* or vertical-lr */
text-orientation: upright; /* optional, adjusts the orientation of the characters */
}
.et-toggle-mob-sidebars-inner .et-toggle {
width:auto;
height:auto;
}
.et-toggle-mob-sidebars-inner svg {
display: none !important;
}
.et-toggle-mob-sidebars-inner.et-content-left .et-toggle {
border-radius: 2% !important;
background-color: #004676;
opacity: 0.9;
color: white;
}
.et-toggle-mob-sidebars-inner {
top: 35%;
}
}