1°

Html

<button class="theme-btn btn-style-wood" type="button" id="submit" name="submit-form">
    <span class="btn-title">Envoyer</span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
</button>

Css

.theme-btn{
    display:inline-block;
    text-align: center;
    text-transform: uppercase;
    -webkit-transition:all 0.5s ease;
    -moz-transition:all 0.5s ease;
    -ms-transition:all 0.5s ease;
    -o-transition:all 0.5s ease;
    transition:all 0.5s ease;
    cursor: pointer;
    border: none;
    outline: none;
}

.theme-btn .btn-title{
    position: relative;
    z-index: 9;
    color: inherit;
}

.theme-btn span:not(.btn-title){
    position: absolute;
    left: 0;
    bottom: 0;
    width: 20%;
    height: 100%;
    border-radius: 50%;
    transform: translateY(150%);
    transition: all 500ms ease;
    background-color: #ab7442;
    z-index: 0;
}

.theme-btn span:nth-child(2){
    left: 20%;
    transition-delay: 100ms;
}

.theme-btn span:nth-child(3){
    left: 40%;
    transition-delay: 200ms;
}

.theme-btn span:nth-child(4){
    left: 60%;
    transition-delay: 300ms;
}

.theme-btn span:nth-child(5){
    left: 80%;
    transition-delay: 400ms;
}

.theme-btn:hover span{
    transform: translateY(0) scale(2);
}

.btn-style-wood{
    position: relative;
    font-size: 16px;
    line-height: 30px;
    color: #ffffff;
    padding: 11px 30px 9px;
    font-weight: 600;
    border-radius: 5px;
    background-color: #ab7442;
    overflow: hidden;
}

.btn-style-wood:hover{
    color: #ab7442;
    box-shadow: 0 10px 20px rgba(0,0,0,0.10);
}

.btn-style-wood span:not(.btn-title){
    background-color: #ffffff !important;
}

2°

Html

<a class="theme-btn btn-style-wood-one" type="button" id="submit" name="submit-form">
 <span class="btn-title">En savoir plus</span> 
 <span></span> 
 <span></span> 
 <span></span> 
 <span></span> 
 <span></span> 
</a>

Css

.theme-btn {
    display: inline-block;
    text-align: center;
    text-transform: uppercase;
    -webkit-transition: all 0.5s ease;
    -moz-transition: all 0.5s ease;
    -ms-transition: all 0.5s ease;
    -o-transition: all 0.5s ease;
    transition: all 0.5s ease;
    cursor: pointer;
    border: none;
    outline: none;
}

.theme-btn .btn-title {
    position: relative;
    z-index: 9;
    color: inherit;
}

.theme-btn span:not(.btn-title) {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 20%;
    height: 100%;
    border-radius: 50%;
    transform: translateY(150%);
    transition: all 500ms ease;
    background-color: #ab7442;
    z-index: 0;
}

.theme-btn span:nth-child(2) {
    left: 20%;
    transition-delay: 100ms;
}

.theme-btn span:nth-child(3) {
    left: 40%;
    transition-delay: 200ms;
}

.theme-btn span:nth-child(4) {
    left: 60%;
    transition-delay: 300ms;
}

.theme-btn span:nth-child(5) {
    left: 80%;
    transition-delay: 400ms;
}

.theme-btn:hover span {
    transform: translateY(0) scale(2);
}

.btn-style-wood-one {
    position: relative;
    font-size: 16px;
    line-height: 24px;
    color: #ab7442;
    padding: 11px 30px 9px;
    font-weight: 600;
    border-radius: 5px;
    border: 3px solid #ab7442;
    overflow: hidden;
}

.btn-style-wood-one:hover {
    color: #ffffff;
    background-color: transparent;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.10);
}