Hjælp med css til en knap

Hej Amino

jeg ønsker en transperant knap med en sort border rundt om og hvid tekst. Når man kører musen henover knappen skal den blive helt hvid med blå skrift.

Jeg bruger themet avada, hvor der er nogle standard knapper installeret. Jeg ønsker derfor, at redigere en af de standard knapper her dens css:

.fusion-button.button-darkgreen,
.fusion-button.button-darkgreen.wpcf7-submit,
.button.darkgreen {
background: #d0e0a5;
background-image: -webkit-gradient(linear, left bottom, left top, from(#a8c76a), to(#d0e0a5));
background-image: -webkit-linear-gradient(bottom, #a8c76a, #d0e0a5);
background-image: -moz-linear-gradient(bottom, #a8c76a, #d0e0a5);
background-image: -o-linear-gradient(bottom, #a8c76a, #d0e0a5);
background-image: linear-gradient(to top, #a8c76a, #d0e0a5);
border: 1px solid #9dba60;
color: #54770f;
}
.fusion-button.button-darkgreen .button-icon-divider-left,
.fusion-button.button-darkgreen.wpcf7-submit .button-icon-divider-left,
.button.darkgreen .button-icon-divider-left,
.fusion-button.button-darkgreen .button-icon-divider-right,
.fusion-button.button-darkgreen.wpcf7-submit .button-icon-divider-right,
.button.darkgreen .button-icon-divider-right {
border-color: #9dba60;
}
.fusion-button.button-darkgreen:hover,
.fusion-button.button-darkgreen.wpcf7-submit:hover,
.button.darkgreen:hover,
.fusion-button.button-darkgreen:focus,
.fusion-button.button-darkgreen.wpcf7-submit:focus,
.button.darkgreen:focus,
.fusion-button.button-darkgreen:active,
.fusion-button.button-darkgreen.wpcf7-submit:active,
.button.darkgreen:active {
background: #a8c76a;
background-image: -webkit-gradient(linear, left bottom, left top, from(#d0e0a5), to(#a8c76a));
background-image: -webkit-linear-gradient(bottom, #d0e0a5, #a8c76a);
background-image: -moz-linear-gradient(bottom, #d0e0a5, #a8c76a);
background-image: -o-linear-gradient(bottom, #d0e0a5, #a8c76a);
background-image: linear-gradient(to top, #d0e0a5, #a8c76a);
border: 1px solid #9dba60;
color: #54770f;
}
.fusion-button.button-darkgreen:hover .button-icon-divider-left,
.fusion-button.button-darkgreen.wpcf7-submit:hover .button-icon-divider-left,
.button.darkgreen:hover .button-icon-divider-left,
.fusion-button.button-darkgreen:focus .button-icon-divider-left,
.fusion-button.button-darkgreen.wpcf7-submit:focus .button-icon-divider-left,
.button.darkgreen:focus .button-icon-divider-left,
.fusion-button.button-darkgreen:active .button-icon-divider-left,
.fusion-button.button-darkgreen.wpcf7-submit:active .button-icon-divider-left,
.button.darkgreen:active .button-icon-divider-left,
.fusion-button.button-darkgreen:hover .button-icon-divider-right,
.fusion-button.button-darkgreen.wpcf7-submit:hover .button-icon-divider-right,
.button.darkgreen:hover .button-icon-divider-right,
.fusion-button.button-darkgreen:focus .button-icon-divider-right,
.fusion-button.button-darkgreen.wpcf7-submit:focus .button-icon-divider-right,
.button.darkgreen:focus .button-icon-divider-right,
.fusion-button.button-darkgreen:active .button-icon-divider-right,
.fusion-button.button-darkgreen.wpcf7-submit:active .button-icon-divider-right,
.button.darkgreen:active .button-icon-divider-right {
border-color: #9dba60;
}
.no-cssgradients .fusion-button.button-darkgreen:hover,
.no-cssgradients .fusion-button.button-darkgreen.wpcf7-submit:hover,
.no-cssgradients .button.darkgreen:hover,
.no-cssgradients .fusion-button.button-darkgreen:focus,
.no-cssgradients .fusion-button.button-darkgreen.wpcf7-submit:focus,
.no-cssgradients .button.darkgreen:focus,
.no-cssgradients .fusion-button.button-darkgreen:active,
.no-cssgradients .fusion-button.button-darkgreen.wpcf7-submit:active,
.no-cssgradients .button.darkgreen:active {
background-color: #a8c76a;
}
.no-cssgradients .fusion-button.button-darkgreen,
.no-cssgradients .fusion-button.button-darkgreen.wpcf7-submit,
.no-cssgradients .button.darkgreen {
background-color: #d0e0a5;