Как сделать кнопку Edit?

function button_click(){ 
  alert("Нажата кнопка!"); 
}

.btn, .fc button { 
    display: inline-block; 
    font-weight: 400; 
    text-align: center; 
    white-space: nowrap; 
    vertical-align: middle; 
    -webkit-user-select: none; 
    -moz-user-select: none; 
    -ms-user-select: none; 
    user-select: none; 
    border: 1px solid transparent; 
    padding: 0.375rem 0.75rem; 
    font-size: 1rem; 
    line-height: 1.5; 
    border-radius: 0.25rem; 
    -webkit-transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, -webkit-box-shadow 0.15s ease-in-out; 
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, -webkit-box-shadow 0.15s ease-in-out; 
    -o-transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out; 
    -moz-transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out; 
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out; 
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out, -webkit-box-shadow 0.15s ease-in-out; 
} 
.btn-danger { 
    color: #FFFFFF; 
    background-color: #FF4961; 
    border-color: #FF4961; 
} 
.box-shadow-2 { 
    -webkit-box-shadow: 0 8px 17px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19); 
    box-shadow: 0 8px 17px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19); 
} 
.btn:not(:disabled):not(.disabled), .fc button:not(:disabled):not(.disabled) { 
    cursor: pointer; 
}

<button type="submit" name="submit" class="btn btn-danger box-shadow-2" onclick = "button_click()">Edit</button>