.stm_buttons_style_15 .btn {
    letter-spacing: 2.2px;
    padding: 20px 34px 19px;
    font-weight: 600;
    font-size: 18px;
    text-align: center;
    text-transform: uppercase;
}

.stm_buttons_style_15 .btn.btn_icon-bg .btn__icon {
    top: 0;
    bottom: 0;
}

.stm_buttons_style_15 .btn.btn_icon-bg.btn_icon-right .btn__icon {
    right: 0;
}

.stm_buttons_style_15 .btn.btn_icon-bg.btn_icon-left .btn__icon {
    left: 0;
}

.stm_buttons_style_15 .btn.btn_icon-right .btn__label {
    margin-right: 26px;
}

.stm_buttons_style_15 .btn.btn_icon-right .btn__icon {
    right: 17px;
}

.stm_buttons_style_15 .btn.btn_icon-left .btn__label {
    margin-left: 26px;
}

.stm_buttons_style_15 .btn.btn_icon-left .btn__icon {
    left: 17px;
}

@media (max-width: 400px) {
    .stm_buttons_style_15 .btn.btn_solid {
        padding: 20px 25px 19px;
    }
}

@media (max-width: 350px) {
    .stm_buttons_style_15 .btn.btn_solid {
        padding: 20px 25px 19px !important;
    }

    .stm_buttons_style_15 .btn.btn_solid span {
        margin: 0 !important;
    }

    .stm_buttons_style_15 .btn.btn_solid .btn__icon {
        display: none;
    }
}