button.css

/* ~~~~~~~ INIT. BTN ~~~~~~~ */

.btn {
    color: whitesmoke;
    text-decoration: none;
    text-align: center;
    margin: 2px;
    width: 550px;
    padding: 10px;
    font-size: 24px;
    border: 2px solid rgb(82, 188, 126);
    display: block;
    /* letter-spacing: 0.5rem; */
    margin-left: auto;
    margin-right: auto;
    font-weight: bold;
	position: relative;	
	/* color: var(--inv); */
	transition: all 500ms cubic-bezier(0.77, 0, 0.175, 1);	
	cursor: pointer;
	user-select: none;
}

.btn:before, .btn:after {
	content: '';
	position: absolute;	
	transition: inherit;
	z-index: -1;
}

.btn:hover {
	color: var(--def);
	transition-delay: .5s;
}

.btn:hover:before {
	transition-delay: 0s;
}

.btn:hover:after {
	background: var(--inv);
	transition-delay: .35s;
}

/* From Left */

.from-left:before, 
.from-left:after {
	top: -1px;
	width: 0;
	height: 102%;
}

.from-left:before {
	right: 0;
	/* border: 3px solid var(--inv); */
	border-left: 0;
	border-right: 0;	
}

.from-left:after {
	left: -1px;
}

.from-left:hover:before,
.from-left:hover:after {
	width: 100.5%;
}

/* ~~~~~~~~~~~~ GLOBAL SETTINGS ~~~~~~~~~~~~ */

*, *:before, *:after {
	box-sizing: border-box;
}

body {
	--def: whitesmoke;
	--inv: rgb(82, 188, 126);
    /*rgb(48, 116, 66)/*
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: column;
	/* height: 100vh; */
	/* width: 100%; */
	/* background-image: linear-gradient(-25deg, #616161 0%, #96B7C4 100%); */
}

html {
	/* font-size: 12px; */
	font-family:  Verdana;
}

#botao {
	margin-bottom: 3rem;
	margin-top: 3rem;
}
#botao:last-child {margin-bottom: 48px;}