.search-form {
     position: relative;
 }

.search-form .form-control {
    padding-right: 35px;
}

.search-submit {
    position: absolute;
    top: 50%;
    -webkit-transform: translate(0, -50%);
    -moz-transform: translate(0, -50%);
    -ms-transform: translate(0, -50%);
    -o-transform: translate(0, -50%);
    transform: translate(0, -50%);
    right: 0;
    width: 37px;
    height: 37px;
    border: none;
    background: url("../../../../img/svg/loupe.svg") center no-repeat;
    background-size: 60%;
    opacity: 0.2;
    -webkit-transition: all 0.5s ease-out;
    -moz-transition: all 0.5s ease-out;
    -ms-transition: all 0.5s ease-out;
    -o-transition: all 0.5s ease-out;
    transition: all 0.5s ease-out;
}

.search-submit:hover {
    opacity: 1;
}