.btn-contain {
    margin: 0px auto;
    min-height: 100px;
}

.btn-underline-contain {
    max-width: 270px;
    margin: 0 auto;
}

.btn-underline {
    font-weight: bold;
    text-align: center;
    color: white;
    text-transform: uppercase;
    text-decoration: none;
    outline: none;
    cursor: pointer;
    margin: 10px;
    padding: 20px;
    border: 2px solid white;
    transition: .3s;
    display: block;
    position: relative;
}

.btn-underline:after {
    position: absolute;
    transition: .3s;
    content: '';
    width: 0;
    bottom: 0;
    height: 3px;
    background: white;
    left: 0;
}

.btn-underline:hover:after {
    width: 100%;
    left: 0;
    background: #ff7d52;
}

.btn-underline:hover {
    border: 2px solid #ffac91;
    -moz-border-image: -moz-linear-gradient(top, #ffac91 0%, #ff7d52 100%);
    -webkit-border-image: -webkit-linear-gradient(top, #ffac91 0%, #ff7d52 100%);
    border-image: linear-gradient(to bottom, #ffac91 0%, #ff7d52 100%);
    border-image-slice: 1;
}

.btn-underline span {
    font-weight: bold;
}

.btn-underline:hover span {
    color: #ff7d52;
}

/* button green */

.btn-contain {
    margin: 0px auto;
    min-height: 100px;
}

.btn-underline-contain {
    max-width: 270px;
    margin: 0 auto;
}

.btn-green {
    font-weight: bold;
    text-align: center;
    color: white;
    text-transform: uppercase;
    text-decoration: none;
    outline: none;
    cursor: pointer;
    margin: 10px;
    padding: 20px;
    border: 2px solid white;
    transition: .3s;
    display: block;
    position: relative;
}

.btn-green:after {
    position: absolute;
    transition: .3s;
    content: '';
    width: 0;
    bottom: 0;
    height: 3px;
    background: white;
    left: 0;
}

.btn-green:hover:after {
    width: 100%;
    left: 0;
    background: #1eff00;
}

.btn-green:hover {
    border: 2px solid #00ff0d;
    -moz-border-image: -moz-linear-gradient(top, #33ff00 0%, #00e40b 100%);
    -webkit-border-image: -webkit-linear-gradient(top, #41ff41 0%, #2fe900 100%);
    border-image: linear-gradient(to bottom, #51ff41 0%, #3cff00 100%);
    border-image-slice: 1;
}

.btn-green span {
    font-weight: bold;
}

.btn-green:hover span {
    color: #15ff00;
}