shadow.css

*{
	box-sizing: border-box;
}

body {
	background-image: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
}

.clock {
	display: block;
	text-align: center;
	font-size: 2em;
	padding: 10px;
	width: 100%;
	font-family: monospace;
}

button {
	border: 4px solid #226fbe;
    border-radius: 15px;
    color: #fff;
    background: #226fbe;
    transition: none;
    position: relative;
    margin-left: 11px;
    margin-bottom: 10px;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    cursor: pointer;
    padding: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    outline: none;
    position: relative;
    text-align: center;
}

.close::after {
	display: inline-block;
  content: "\00d7"; /* This will render the 'X' */
}
.close:hover {
  opacity: 1;
}
.close:before, .close:after {
  position: absolute;
  right: 15px;
  top: 2px;
  content: ' ';
  height: 20px;
  width: 2px;
  background-color: #333;
}
.close:before {
  transform: rotate(45deg);
}
.close:after {
  transform: rotate(-45deg);
}
.close:hover {
	cursor: pointer;
}