.form_btn::before {
    box-shadow: 0 0 0 rgba(255, 255, 255, .4);
    animation: pulso 2s infinite;
    transition: .5s;
    content: "";
    width: 10px;
    height: 10px;
    border: 3px solid #fff;
    position: absolute;
    left: 17px;
    border-radius: 50%;
    top: 0;
    bottom: 0px;
    margin: auto;
}
@keyframes pulso {
  0% {
    box-shadow: 0 0 0 0px rgba(255, 255, 255, 0.5);
  }
  100% {
    box-shadow: 0 0 0 10px rgba(255, 255, 255, 0);
  }
}
.form_btn {
    background: #28a745;
    padding: 13px 22px 13px 40px;
    border-radius: 7px;
    text-decoration: none;
    color: #fff !important;
    font-size: 21px;
    font-weight: 700;
    position: relative;
    top: 20px;
}

.form_main {
    position: fixed;
    top: 0px;
    right: -100%;
    /* border: 2px solid #000; */
    padding: 24px 82px 24px 50px;
    background: #f1f1f1;
    width: 513px;
    height: 100%;
    z-index: 9;
}
.input {
    background: #f1f1f1 !important;
    /* padding: 5px 0px; */
    margin: 2px 0px;
    border-width: 0 0 2px 0 !important;
}
.cencle {
    color: #fff;
    position: absolute;
    font-size: 41px;
    top: 66px;
    font-weight: bold;
    right: 40px;
    background: #000;
    padding: 13px;
}
.form_box {
    margin-top: 27px;
}

@media only screen and (max-width: 500px){
    .form_main {
    padding: 151px 82px 24px 50px;
    width: 100%;
     
    }

}