Edit in JSFiddle

<link href='http://fonts.googleapis.com/css?family=Oswald' rel='stylesheet' type='text/css'>

<a class="push_button red">Push the button</a>
<a class="push_button blue">Push the button</a>

html{
    background:#f0f0f0;
    padding:20px;
}

body {
    width: 250px;
    margin: 0 auto;
}

.push_button {
    position: relative;
    width:220px;
    height:40px;
    text-align:center;
    color:#FFF;
    text-decoration:none;
    line-height:43px;
    font-family:'Oswald', Helvetica;
    display: block;
    margin: 30px;
}
.push_button:before {
    background:#f0f0f0;
    background-image:-webkit-gradient(linear, 0% 0%, 0% 100%, from(#D0D0D0), to(#f0f0f0));
    
    -webkit-border-radius:5px;
    -moz-border-radius:5px;
    border-radius:5px;
    
    -webkit-box-shadow:0 1px 2px rgba(0, 0, 0, .5) inset, 0 1px 0 #FFF; 
    -moz-box-shadow:0 1px 2px rgba(0, 0, 0, .5) inset, 0 1px 0 #FFF; 
    box-shadow:0 1px 2px rgba(0, 0, 0, .5) inset, 0 1px 0 #FFF;
    
    position: absolute;
    content: "";
    left: -6px; right: -6px;
    top: -6px; bottom: -10px;
    z-index: -1;
}

.push_button:active {
    -webkit-box-shadow:0 1px 0 rgba(255, 255, 255, .5) inset, 0 -1px 0 rgba(255, 255, 255, .1) inset;
    top:5px;
}
.push_button:active:before{
    top: -11px;
    bottom: -5px;
    content: "";
}

.red {
    text-shadow:-1px -1px 0 #A84155;
    background: #D25068;
    border:1px solid #D25068;
    
    background-image:-webkit-linear-gradient(top, #F66C7B, #D25068);
    background-image:-moz-linear-gradient(top, #F66C7B, #D25068);
    background-image:-ms-linear-gradient(top, #F66C7B, #D25068);
    background-image:-o-linear-gradient(top, #F66C7B, #D25068);
    background-image:linear-gradient(to bottom, #F66C7B, #D25068);
    
    -webkit-border-radius:5px;
    -moz-border-radius:5px;
    border-radius:5px;
    
    -webkit-box-shadow:0 1px 0 rgba(255, 255, 255, .5) inset, 0 -1px 0 rgba(255, 255, 255, .1) inset, 0 4px 0 #AD4257, 0 4px 2px rgba(0, 0, 0, .5);
    -moz-box-shadow:0 1px 0 rgba(255, 255, 255, .5) inset, 0 -1px 0 rgba(255, 255, 255, .1) inset, 0 4px 0 #AD4257, 0 4px 2px rgba(0, 0, 0, .5);
    box-shadow:0 1px 0 rgba(255, 255, 255, .5) inset, 0 -1px 0 rgba(255, 255, 255, .1) inset, 0 4px 0 #AD4257, 0 4px 2px rgba(0, 0, 0, .5);
}

.red:hover {
    background: #F66C7B;
    background-image:-webkit-linear-gradient(top, #D25068, #F66C7B);
    background-image:-moz-linear-gradient(top, #D25068, #F66C7B);
    background-image:-ms-linear-gradient(top, #D25068, #F66C7B);
    background-image:-o-linear-gradient(top, #D25068, #F66C7B);
    background-image:linear-gradient(top, #D25068, #F66C7B);
}

.blue {
    text-shadow:-1px -1px 0 #2C7982;
    background: #3EACBA;
    border:1px solid #379AA4;
    background-image:-webkit-linear-gradient(top, #48C6D4, #3EACBA);
    background-image:-moz-linear-gradient(top, #48C6D4, #3EACBA);
    background-image:-ms-linear-gradient(top, #48C6D4, #3EACBA);
    background-image:-o-linear-gradient(top, #48C6D4, #3EACBA);
    background-image:linear-gradient(top, #48C6D4, #3EACBA);
    
    -webkit-border-radius:5px;
    -moz-border-radius:5px;
    border-radius:5px;
    
    -webkit-box-shadow:0 1px 0 rgba(255, 255, 255, .5) inset, 0 -1px 0 rgba(255, 255, 255, .1) inset, 0 4px 0 #338A94, 0 4px 2px rgba(0, 0, 0, .5);
    -moz-box-shadow:0 1px 0 rgba(255, 255, 255, .5) inset, 0 -1px 0 rgba(255, 255, 255, .1) inset, 0 4px 0 #338A94, 0 4px 2px rgba(0, 0, 0, .5);
    box-shadow:0 1px 0 rgba(255, 255, 255, .5) inset, 0 -1px 0 rgba(255, 255, 255, .1) inset, 0 4px 0 #338A94, 0 4px 2px rgba(0, 0, 0, .5);
}

.blue:hover {
    background: #48C6D4;
    background-image:-webkit-linear-gradient(top, #3EACBA, #48C6D4);
    background-image:-moz-linear-gradient(top, #3EACBA, #48C6D4);
    background-image:-ms-linear-gradient(top, #3EACBA, #48C6D4);
    background-image:-o-linear-gradient(top, #3EACBA, #48C6D4);
    background-image:linear-gradient(top, #3EACBA, #48C6D4);
}