laravel/resources/assets/sass/theme.scss

// Buttons
.btn {
    box-sizing: border-box;
    display: inline-block;
    font-family: 'Raleway';
    font-weight: 600;
    height: 38px;
    letter-spacing: .1rem;
    line-height: 38px;
    padding: 0 20px;
    text-align: center;
    text-transform: uppercase;
    white-space: nowrap;
}