button.css

@import url('https://fonts.googleapis.com/css?family=Mukta:700');
 
button {    
     line-height: 1.5;
	 position: relative;
	 display: inline-block;
	 cursor: pointer;
	 outline: none;
	 border: 0;
	 vertical-align: middle;
	 text-decoration: none;
	 background: transparent;
	 padding: 0;
	 font-size: 1rem;
	 font-family: 'Mukta', sans-serif;
}
 button.save {
	 width: 12rem;
	 height: auto;
}
 button.save .circle {
	 transition: all 0.45s cubic-bezier(0.65, 0, 0.076, 1);
	 position: relative;
	 display: block;
	 margin: 0;
	 width: 3rem;
	 height: 3rem;
	 background: #282936;
	 border-radius: 1.625rem;
}
 button.save .circle .icon {
	 transition: all 0.45s cubic-bezier(0.65, 0, 0.076, 1);
	 position: absolute;
	 top: 0;
	 bottom: 0;
	 margin: auto;
	 background: #fff;
}
 button.save .circle .icon.arrow {
	 transition: all 0.45s cubic-bezier(0.65, 0, 0.076, 1);
	 left: 0.625rem;
	 width: 1.125rem;
	 height: 0.125rem;
	 background: none;
}
 button.save .circle .icon.arrow::before {
	 position: absolute;
	 content: '';
	 top: -0.25rem;
	 right: 0.0625rem;
	 width: 0.625rem;
	 height: 0.625rem;
	 border-top: 0.125rem solid #fff;
	 border-right: 0.125rem solid #fff;
	 transform: rotate(45deg);
}
 button.save .button-text {
	 transition: all 0.45s cubic-bezier(0.65, 0, 0.076, 1);
	 position: absolute;
	 top: 0;
	 left: 0;
	 right: 0;
	 bottom: 0;
	 padding: 0.75rem 0;
	 margin: 0 0 0 1.85rem;
	 color: #282936;
	 font-weight: 700;
	 line-height: 1.6;
	 text-align: center;
	 text-transform: uppercase;
}
 button:hover .circle {
	 width: 100%;
}
 button:hover .circle .icon.arrow {
	 background: #fff;
	 transform: translate(1rem, 0);
}
 button:hover .button-text {
	 color: #fff;
}