Button Border Radius

Use the following code snippet to adjust the corners on your form buttons.

Before

After

.slds-scope .slds-button_inverse,
.slds-scope .slds-button_inverse:link,
.slds-scope .slds-button_inverse:visited,
.slds-scope .slds-button-group .slds-button_icon-inverse,
.slds-scope .slds-button-group .slds-button_icon-inverse:link,
.slds-scope .slds-button-group .slds-button_icon-inverse:visited {
 border-radius: 15px;
 background: #ff9900;
 color: #fff;
 border: 0;
}
.slds-scope .slds-button_inverse:hover,
.slds-scope .slds-button_inverse:focus {
 color: #fff;
 background: #ff6600;
 border: 0;
}