.main-sec {
    background-color: #24353F;
    overflow: hidden;
}
.p-color{
    background-color: #24353F;
}
.box {
    padding: 40px;
    background-color: #24353F;
    filter: drop-shadow( 1px 1px 50px #000);
}
.navb {
    padding: 10px;
    background-color: #24353F;
    filter: drop-shadow( 1px 1px 50px #000);
}
h1 {
    font-size: 40px;
    color: #17A2B8;
}
.inputbox {
    position: relative;
    width: 196px;
}

.inputbox input {
    position: relative;
    width: 100%;
    padding: 20px 10px 10px;
    background: transparent;
    outline: none;
    box-shadow: none;
    border: none;
    color: #23242a;
    font-size: 1em;
    letter-spacing: 0.05em;
    transition: 0.5s;
    z-index: 10;
}

.inputbox span {
    position: absolute;
    left: 0;
    padding: 20px 10px 10px;
    font-size: 1em;
    color: #8f8f8f;
    letter-spacing: 00.05em;
    transition: 0.5s;
    pointer-events: none;
}

.inputbox input:valid ~span,
.inputbox input:focus ~span,
.inputbox input:invalid ~span {
    color: #45f3ff;
    transform: translateX(-10px) translateY(-34px);
    font-size: 0,75em;
}

.inputbox i {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: #45f3ff;
    border-radius: 4px;
    transition: 0.5s;
    pointer-events: none;
    z-index: 9;
}

.inputbox input:valid ~i,
.inputbox input:focus ~i{
    height: 44px;
}
a {
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}