Pulsanti con contorno arrotondati

/* Green */
.success {
  border-color: #4CAF50;
  color: green;
}

.success:hover {
  background-color: #4CAF50;
  color: white;
}

/* Blue */
.info {
  border-color: #2196F3;
  color: dodgerblue
}

.info:hover {
  background: #2196F3;
  color: white;
}

/* Orange */
.warning {
  border-color: #ff9800;
  color: orange;
}

.warning:hover {
  background: #ff9800;
  color: white;
}

/* Red */
.danger {
  border-color: #f44336;
  color: red
}

.danger:hover {
  background: #f44336;
  color: white;
}

/* Gray */
.default {
  border-color: #e7e7e7;
  color: black;
}

.default:hover {
  background: #e7e7e7;
}
</style>
</head>
<body>

<h1>Rounded Outline Buttons</h1>

<button class="btn success">Success</button>
<button class="btn info">Info</button>
<button class="btn warning">Warning</button>
<button class="btn danger">Danger</button>
<button class="btn default">Default</button>

</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.btn {
border: 2px solid black;
border-radius: 5px;
background-color: white;
color: black;
padding: 14px 28px;
font-size: 16px;
cursor: pointer;
}

/* Green */
.success {
border-color: #4CAF50;
color: green;
}

.success:hover {
background-color: #4CAF50;
color: white;
}

/* Blue */
.info {
border-color: #2196F3;
color: dodgerblue
}

.info:hover {
background: #2196F3;
color: white;
}

/* Orange */
.warning {
border-color: #ff9800;
color: orange;
}

.warning:hover {
background: #ff9800;
color: white;
}

/* Red */
.danger {
border-color: #f44336;
color: red
}

.danger:hover {
background: #f44336;
color: white;
}

/* Gray */
.default {
border-color: #e7e7e7;
color: black;
}

.default:hover {
background: #e7e7e7;
}
</style>
</head>
<body>

<h1>Rounded Outline Buttons</h1>

<button class="btn success">Success</button>
<button class="btn info">Info</button>
<button class="btn warning">Warning</button>
<button class="btn danger">Danger</button>
<button class="btn default">Default</button>

</body>
</html>