style.css

* {
  margin: 0;
  padding: 0;
  border-size: border-box;
}

html, body {
  height: 100vh;
  background: #666666;
  font-family: 'Open Sans', sans-serif;
}

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

button {
  padding: 25px 75px;
  width: 300px;
  color: #ffffff;
  text-transform: uppercase;
  text-decoration: none;
  border: none;
  border-radius: 15px;
  outline: none;
  font-size: 25px;
  letter-spacing: 2px;
  font-weight: 900;
  cursor: pointer;
}

.button-success {
  background-color: #0f3443;
  margin-right: 15px;
}

.button-error {
  background-color: #190A05;
}

svg {
  width: 350px;
}

.modal {
  height: 600px;
  width: 600px;
  background-color: #ffffff;
  border-radius: 25px;
  box-shadow: 10px 0 50px rgba(0, 0, 0, 0.5);
  position: fixed;
  visibility: hidden;
  overflow: hidden;
  opacity: 0;
  transition: visibility 0.5s, opacity 0.5s;
}

.active {
  visibility: visible;
  opacity: 1;
}

.modal-header {
  height: 100px;
  padding: 0 20px 0 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  color: #ffffff;
}

.header-success {
  background: linear-gradient(90deg, #34e89e, #0f3443);
}

.header-error {
  background: linear-gradient(90deg, #870000, #190A05);
}

.title {
  flex: 50%;
  font-size: 30px;
  font-weight: 600;
}

.close {
  flex: 50%;
  text-align: right;
  cursor: pointer;
}

.fa-times {
  font-size: 25px;
}

.modal-body {
  height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/*Success SVG*/
.active .path {
  stroke-dasharray: 1000;
  stroke-dashoffset: 0;
}

.active .path.circle {
  animation: circle 0.9s ease-in-out;
}

.active .path.check {
  stroke-dashoffset: -100;
  animation: check 0.9s .40s ease-in-out forwards;
}

@keyframes circle {
  0% {
    stroke-dashoffset: 1000;
  }
  100% {
    stroke-dashoffset: 0;
  }
}

@keyframes check {
  0% {
    stroke-dashoffset: -100;
  }
  100% {
    stroke-dashoffset: 900;
  }
}
/*Success SVG End*/