project-codepen/src/pages/Main.css

#body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 90vh;
    font-family: 'Telefon Black', Sans-Serif;
}

.box {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #170422;
  max-width: 500px;
}

.box::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: #fff;
  z-index: -1;
}

.box::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: #fff;
  z-index: -2;
  filter: blur(40px);
}

.box::before,
.box::after {
  background: linear-gradient(235deg, #89ff00, #060c21, #00bcd4);
}

.content {
  padding: 40px;
  box-sizing: border-box;
  color: #ffffff;
  font-size: 20px;
}

.btn_form {
    width: 180px;
    height: 40px;
    text-decoration: none;
    color: #c9b6cf;
    text-align: center;
    line-height: 20px;
    display: block;
    margin-left: 10px;
    margin-right: 10px;
    font: normal 17px arial;
    cursor: pointer;
}

.btn_form:not(.active) {
    box-shadow: inset 0 1px 1px rgba(111, 55, 125, 0.8), inset 0 -1px 0px rgba(63, 59, 113, 0.2), 0 9px 16px 0 rgba(0, 0, 0, 0.3), 0 4px 3px 0 rgba(0, 0, 0, 0.3), 0 0 0 1px #150a1e;
    background-image: linear-gradient(#3b2751, #271739);
    text-shadow: 0 0 21px rgba(223, 206, 228, 0.5), 0 -1px 0 #311d47;
}
  
.btn_form:not(.active):hover,
.btn_form:not(.active):focus {
    transition: color 200ms linear, text-shadow 500ms linear;
    color: #fff;
    text-shadow: 0 0 21px rgba(223, 206, 228, 0.5), 0 0 10px rgba(223, 206, 228, 0.4), 0 0 2px #2a153c;
}

.btn_form:not(:hover) {
      transition: 0.6s;
}

.card {
    width: 500px;
    height: 360px;
    padding-left: 100px;
    margin-left: 470px;
    margin-top: 100px;
    padding-top: 10px;
    background: linear-gradient(#f0e2ef, #faf5f5);
    -webkit-box-shadow: inset 0 0 40px rgb(36, 16, 61);
    -moz-box-shadow: inset 0 0 40px rgb(37, 12, 58);
    box-shadow: inset 0 0 40px rgb(26, 10, 48);
}

.nick_style {
    display: block;
    width: 100px;
    margin-left: 115px;
}

.block_search {
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn_search {
    width: 180px;
    height: 40px;
    text-decoration: none;
    color: #b5a2bb;
    margin-right: 200px;
    text-align: center;
    line-height: 20px;
    font: normal 17px arial;
    cursor: pointer;
    margin-bottom: 10px;
}

.btn_search:not(.active) {
    box-shadow: inset 0 1px 1px rgba(111, 55, 125, 0.8), inset 0 -1px 0px rgba(63, 59, 113, 0.2), 0 9px 16px 0 rgba(0, 0, 0, 0.3), 0 4px 3px 0 rgba(0, 0, 0, 0.3), 0 0 0 1px #150a1e;
    background-image: linear-gradient(#3b2751, #271739);
    text-shadow: 0 0 21px rgba(223, 206, 228, 0.5), 0 -1px 0 #311d47;
}
  
.btn_search:not(.active):hover,
.btn_search:not(.active):focus {
    transition: color 200ms linear, text-shadow 500ms linear;
    color: #fff;
    text-shadow: 0 0 21px rgba(223, 206, 228, 0.5), 0 0 10px rgba(223, 206, 228, 0.4), 0 0 2px #2a153c;
}

.btn_search:not(:hover) {
      transition: 0.6s;
}

.block_button_back {
    padding-top: 20px;
}