CSS Button - Vertically centre text

I would use line-height as bchhun as mentioned. Also, padding-top & padding-bottom can help.

Flexbox helped me nail it. Assume you have an excel button (an anchor tag, really).

HTML

<a class="btn-excel" href="/Export/ExportListToExcel">
    Export To Excel
</a>

CSS

.btn-excel {
    background-color: #32CD32; /*lime green*/
    color: #fff;
    outline: none;
    border-radius: 0.3rem;
    text-decoration: none;
    width: 5rem;
    height: 2.5rem;
    /* Flex rules 'em all */
    display: flex;
    justify-content: center;
    align-items: center;
}
.btn-excel:hover {
    background-color: #808000; /*olive*/
    cursor: pointer;
    text-decoration: none;
}

HTML:

<div class="buyBtn"><a href="#">Button</a></div>

CSS:

.buyBtn{ 
    background:url(../images/buyBtn.png) no-repeat; 
    width:97px;     
    height:28px; 
    display: table-cell;
    vertical-align: middle;
}

.buyBtn a{
    color:#fff!important; 
    font-weight:normal!important; 
    text-decoration:none;
    padding-left:27px;
    text-shadow:none!important;
}

No need to use padding-top or margin-top for vertical align. Just use display: table-cell; and vertical-align: middle;. Thats it.

Use line-height to center it vertically. I usually use the same value as its height.