.btn-group,
.btn-group-vertical {
    position: relative;
    display: inline-flex;
    vertical-align: middle;
}

.btn-check {
    position: absolute;
    clip: rect(0, 0, 0, 0);
    pointer-events: none;
}

.btn-group>.btn-check:checked+.btn {
    z-index: 1;
}

.btn-check:checked+.btn-outline-primary {
    color: #fff;
    background-color: var(--primary-colour);
    border-color: var(--primary-colour);
}

.btn-group>.btn:not(:first-child) {
    margin-left: -1px;
}

.btn-group>.btn {
    position: relative;
    flex: 1 1 auto;
    padding: 10px 30px;
    border: 2px solid var(--primary-colour);
}

.btn-group>.btn:first-child,
.btn-group-first {
    border-top-left-radius: 10px;
    border-bottom-left-radius: 10px;
}

.btn-group>.btn:last-child {
    border-top-right-radius: 10px;
    border-bottom-right-radius: 10px;
}

label.btn {
    margin-bottom: 0;
}