Input 4 - Username

.input4 {
line-height: 28px;
border: 2px solid transparent;
border-bottom-color: #777;
padding: .2rem 0;
outline: none;
background-color: transparent;
color: #0d0c22;
transition: .3s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.input4:focus, input4:hover {
outline: none;
padding: .2rem 1rem;
border-radius: 1rem;
border-color: #7a9cc6;
}

.input4::placeholder {
color: #777;
}

.input4:focus::placeholder {
opacity: 0;
transition: opacity .3s;
}