style.css

html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}

:root {
  --bg-color: #eef0f4;
  --color: #333;
  --togglebg: #333;
  --contactIconColor: crimson;
  --inputTextColor: #111;
  --deleteIconColor: #111;
  --filter: drop-shadow(-8px -8px 12px #ffffff)
    drop-shadow(8px 8px 12px #c3c5c8);
  --roundcolor: #eef0f4;
  --toggleslider: #111;
  --togglesliderColor: #111;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  line-height: 1.4;
  background: var(--bg-color);
}

.container {
  margin: 0 auto;
  padding-left: 10px;
  padding-right: 10px;
  color: var(--color);
  margin-top: 5vh;
  margin-bottom: 5vh;
  display: flex;
  flex-direction: row;
}

.ListContainer {
  width: 50%;
  margin: 56px 30px 0 51px;
  max-width: 500px;
  border-radius: 0.25rem;
  padding: 1.5rem 2rem;
  border-radius: 16px;
  background: var(--bg-color);
  border: 12px solid var(--bg-color);
  filter: var(--filter);
}

.person {
  display: flex;
  /* justify-content: space-between; */
  column-gap: 0.75rem;
  margin-bottom: 1.5rem;
  align-items: center;
}

.person img {
  width: 75px;
  height: 75px;
  object-fit: cover;
  border-radius: 50%;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.contactdetail {
  margin-right: 5rem;
}

.contactIcon {
  margin: 0 10px 0 5px;
  font-size: 14px;
  color: var(--contactIconColor);
}

.person h4 {
  margin-bottom: 0.35rem;
}

.person p {
  margin-bottom: 0;
}

.delete-contact {
  border: none;
  background-color: transparent;
  outline: none;
  cursor: pointer;
  float: right;
  display: block;
  position: absolute;
  right: 10%;
}

.delete-contact svg {
  width: 30px;
  height: 30px;
  pointer-events: none;
  fill: var(--deleteIconColor);
}

form {
  width: 50%;
  left: 50%;
  margin-top: 15%;
  margin-left: 7%;
  position: fixed;
}

.name,
.number,
.email,
.img {
  display: flex;
  justify-content: space-evenly;
  margin-right: 30%;
  align-items: center;
  margin-bottom: 30px;
  background: var(--bg-color);
  border: 5px solid var(--bg-color);
  filter: var(--filter);
}

input[type="text"],
input[type="email"],
input[type="url"],
input[type="tel"] {
  width: 240px;
  background: transparent;
  border: none;
  font-family: "Roboto", sans-serif;
  font-size: 16px;
  font-weight: 200px;
  padding: 10px 0;
  transition: border 0.5s;
  outline: none;
  color: var(--inputTextColor);
  font-weight: bold;
}

.submitbtn {
  display: none;
}