style.css

@keyframes load {
    0%{opacity: 0;}
    100%{opacity: 100;}
}

body {
    animation-name: load;
    animation-duration: 1s;
    background-color: white;
    font-family:-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin-top: 0;
}

::selection {
    color: white;
    background-color: darkslategrey;
}

a {
    color: darkslategrey;
}

@keyframes nav_slide_in {
    0%{transform: translateY(-50px);}
    100%{transform: translateY(0px);}
}

.dropbtn {
    background-color: darkslategrey;
    color: wheat;
    min-width: 155px;
    padding: 7%;
    font-size: 100%;
    border: 1px solid darkslategrey;
    border-radius: 5px;
    cursor: pointer;
}

/* The container <div> - needed to position the dropdown content */
.dropdown {
    animation-name: nav_slide_in;
    animation-duration: 1s;
    position: relative;
    display: inline-block;
}

@keyframes slide_in {
    0%{transform: scale(0);}
    100%{transform: scale(1); z-index: 0;}
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
    animation: slide_in 0.3s forwards;
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 155px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 0;
}

/* Links inside the dropdown */
.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: #f1f1f1}

/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content {
    display: block;
}

#header {
    text-align: center;
    font-size: 300%;
    color: darkslategrey;
}

.info {
    text-align: center;
    font-size: 120%;
    margin-top: 5%;
}

.main {
    background-color: wheat;
    text-align: center;
    margin-top: 7%;
    padding: 2%;
    font-size: 120%;
    border-radius: 5px;
    box-shadow: rgb(172, 156, 125) 3px 3px 3px;
}

.main textarea {
    font-size: 120%;
}

.main input {
    font-size: 120%;
}

#base, #inbase, #outbase {
    font-size: 100%;
}

#base:hover, #inbase:hover, #outbase:hover {
    cursor: pointer;
}

#calcbtn {
    font-size: 140%;
    box-shadow: gray 1px 1px;
}

#calcbtn:hover {
    cursor: pointer;
}

#calcbtndiv {
    margin-top: 2%;
}

.credits {
    text-align: center;
    margin-top: 3%;
    font-size: 120%;
}

.credits h2 {
    text-decoration: underline;
}

.howitworks {
    text-align: center;
    margin-top: 3%;
    font-size: 120%;
}

.howitworks h2 {
    text-decoration: underline;
}



@media all and (max-width: 600px){
    #base {
        font-size: 140%;
    }

    .main textarea {
        font-size: 120%;
    }
}