.form {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.btn {
    margin: auto;
}

.btn .fa {
    margin-left: -6px;
}

#btn-mail {
    height: 60px;
    width: 260px;
    border: none;
    border-radius: 45px;
    background: white;
    text-transform: uppercase;
    font-size: 13px;
    font-weight: 800;
    color: #ca1a70;
    cursor: pointer;
    outline: none;
    position: absolute;
    animation: slide 0.4s ease-in-out forwards;
    animation-play-state: paused;
}

#btn-mail:hover {
    background-color: #ca1a70;
    color: white;
    transition: all 0.2s ease-in;
}

#btn-valid {
    height: 60px;
    width: 60px;
    border: none;
    border-radius: 45px;
    background: #ca1a70;
    text-transform: uppercase;
    letter-spacing: 2.2px;
    font-size: 13px;
    color: white;
    cursor: pointer;
    outline: none;
    position: absolute;
    margin-left: 200px;
    -ms-transform: rotate(0deg);
    /* IE 9 */
    -webkit-transform: rotate(0deg);
    /* Chrome, Safari, Opera */
    transform: rotate(0deg);
    animation: checker 0.4s ease-in-out forwards;
    animation-play-state: paused;
    display: none;
}

#txt-mail {
    height: 60px;
    width: 260px;
    border: none;
    border-radius: 45px;
    background: white;
    outline: none;
    text-align: center;
    font-size: 12px;
    padding-right: 80px;
    color: grey;
    line-height: 60px;
}

@keyframes slide {
    to {
        width: 60px;
        margin-left: 200px;
    }
}

@keyframes checker {
    to {
        margin-left: 0px;
        background: #3FC380;
        -ms-transform: rotate(360deg);
        /* IE 9 */
        -webkit-transform: rotate(360deg);
        /* Chrome, Safari, Opera */
        transform: rotate(360deg);
    }
}