html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}

blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}

body {background-color: cadetblue;
}

.cabecalho {
	background-color: rgb(25,25,112);
	height: 100px;
	display: flex;
	justify-content: center;
	align-items: center;
    opacity: 0.8;
}

.titulo {
	font-size: 70px;
	color: rgb(255,250,250);
	text-decoration: underline;
	text-shadow: 10px 10px 15px rgb(0,0,0);
}

.teste {
    display: flex;
    justify-content: center;
}

.foto {
    background: url(../imagens/Foto_3x4.png);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    height: 350px;
	width: 300px;
    align-items: center;
    opacity: 0.8;
    border-radius: 15px;
    justify-content: space-around;
    flex-direction: column;
}

.foto:hover {
    opacity: 1;
}

.foto:hover .nome{
    opacity: 1;
}

.nome {
    opacity: 0;
    box-shadow: 0;
    font-size: 40px;
}

.nome:hover {
    

}
.divFoto {
	display: flex;
    width: 300px;
    height: 350px;
    box-shadow: 10px 10px 15px rgb(0,0,0);
    border-radius: 15px;
    align-items: center;
    justify-content: center;
}

.divFoto:hover {
    opacity: 1;
}

.menu{
    width: 200px;
     margin: 30px;
     font-size: 50px;
     color: rgb(255,255,255);
     text-decoration: underline;
     text-shadow: 5px 5px 5px rgb(0,0,0);
     justify-content: center;
     align-items: center;
    }

*{
    font-family: arial, helvetica, sans-serif;
    font-size: 30px;
}

.topico{
    padding: 0;
    margin: 0;
    width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.subtop{
    list-style: none;
    margin: 10px;
    display: inline;
    align-items: center;
    justify-content: center;
    box-shadow: 5px 10px 10px rgb(0,0,0);
}

.subtop a{
    padding: 5px 10px;
    margin: 0;
    border: 0px solid rgb(255,0,0);
    background: rgb(34,139,34);
    text-decoration: none;
    color: rgb(255,255,255);
    border-radius: 10px;
    box-shadow: 10px;
}

.subtop a:hover{
    background: rgb(144,238,144);
    color: rgb(0,0,0);
    border-color: rgb(0,0,0);
}

.subtop a:active{
    background-color: rgb(47,79,79);
}

.tit_inicio {
    font-size: 20px;
    text-decoration: underline;
    margin-left: 15px;

}

ul {
    margin-top: 10px;
    list-style: circle;
    margin-left: 100px;
    font-size: 17px;
}

li {
    margin-left: : 20px;
    list-style: square inside;
}

.botao01{
     background: rgb(255,218,185);
     border: 1px solid rgb(204, 204, 206);
     border-radius: 5px;
     box-shadow: 0 5px 0 rgba(0, 0, 0, .3),
                   0 4px 9px rgba(0, 0, 0, 0.2);
     color: rgb(97, 97, 101);
     display: block;
     font-family: "Trebuchet MS";
     font-size: 10px;
     font-weight: bold;
     line-height: 15px;
     text-align: center;
     text-decoration: none;
     text-transform: uppercase;
     text-shadow:1px 1px 0 rgb(255,255,255);
     padding: 5px 5px;
     position: row;
     width: 80px;
     margin-top: 10px;
     margin-left: 10px;
}
 
 .botao01:hover{
    background-color: rgb(240,128,128);
 }
    
 .botao01:active{
    background-color: rgb(139,0,0);
     box-shadow: inset 0 0 7px rgba(0, 0, 0, .2);
     top: 4px;
    }
    .botao01:active:before{
     border: none;
     box-shadow:none;
    }


Read more: http://www.linhadecodigo.com.br/artigo/3600/botao-com-css-3-como-criar-um-botao-sem-imagens.aspx#ixzz7RfM54KK2