style.css

@import url("https://fonts.googleapis.com/css2?family=Roboto&family=Russo+One&display=swap");
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  overflow-x: hidden;
}
body {
  overflow-x: hidden;
  background-color: #ecf0f1;
  font-family: "Roboto", sans-serif;
}

/* Header */
header {
  width: 100%;
  height: 10vh;
  background-color: #9b59b6;
  display: grid;
  place-items: center;
}
#logo-img {
  width: 40px;
  height: 40px;
}
/* Container */
.container {
  width: 100%;
  min-height: 90vh;
  background-color: yellow;
  margin: 0 auto;
  display: grid;
  grid-template-rows: 5% 10% 85%;
}
/* Current Time Box */
.current-time-box {
  width: 100%;
  background-color: #9b59b6;
  display: flex;
  justify-content: center;
  align-items: center;
  letter-spacing: 3px;
  font-family: "Russo One", sans-serif;
  font-weight: lighter;
}

/* Set Alarm Box */
.set-alarm-box {
  width: 100%;
  background-color: #ecf0f1;
  color: #9b59b6;
  border-bottom: 2px solid #9b59b6;
  display: flex;
  justify-content: space-evenly;
  align-items: center;
}
.set-alarm-box h3 {
  text-transform: uppercase;
  font-weight: bold;
}
input {
  width: 80px;
  background-color: #ecf0f1;
  border: none;
  border-bottom: 2px solid #9b59b6;
  outline: none;
  height: 30px;
  font-size: 1.2rem;
  padding: 5px;
}

select {
  background: #9b59b6;
  outline: none;
  padding: 10px;
  color: #ecf0f1;
  font-size: 1.2rem;
}
select option {
  background-color: #9b59b6;
  color: #ecf0f1;
  border: none;
  outline: none;
}

select option:hover {
  background-color: #ecf0f1;
  color: #9b59b6;
}
.set-btn,
.delete-btn {
  background-color: #9b59b6;
  color: #ecf0f1;
  outline: none;
  border: none;
  padding: 10px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 3px;
  transition: 0.3s ease;
}
.set-btn:hover,
.delete-btn:hover {
  box-shadow: 0px 5px 5px rgba(0, 0, 0, 0.6);
}
/* Alarm display box */
.alarm-display-box {
  background-color: #ecf0f1;
}

.alarm-box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: #9b59b6;
  color: #ecf0f1;
  width: 100%;
  height: 100%;
  padding: 1rem;
  visibility: hidden;
}
.delete-btn {
  background-color: #ecf0f1;
  color: #9b59b6;
  margin-top: 1rem;
}

/* Error msg */
.error-msg {
  color: #fff;
  text-align: center;
}
@media (max-width: 768px) {
  .container {
    width: 100%;
  }
  input {
    font-size: 1rem;
    border: 1px solid #34495e;
  }
  input:focus {
    box-shadow: 0px 0px 3px #34495e;
  }
  select {
    font-size: 1rem;
    padding: 5px;
  }
  .set-alarm-box h3 {
    display: none;
  }
}