button {
 width: 150px;
 padding: 4px 12px;
 border: none;
 border-radius: 7px;
 background: linear-gradient(#4faefc,#006bff);
 color: #fff;
 font-size: 17px;
 font-family: sans-serif;
}

button:focus {
 background: linear-gradient(#44aefc,#026bff);
 outline: 3px solid #4faefc;
}