/* QUESTO VA NEL HEAD*/
.btn-group .button {
background-color: #4CAF50; /* Green */
border: 1px solid green;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
font-size: 16px;
cursor: pointer;
width: 150px;
display: block;}
.btn-group .button:not(:last-child) {
border-bottom: none; } /* Prevent double borders */
.btn-group .button:hover {
background-color: #3e8e41;}
/* QUESTO VA NEL BODY*/
<div class="btn-group">
<button class="button">Button</button>
<button class="button">Button</button>
<button class="button">Button</button>
<button class="button">Button</button>
</div>
